(Removed double post)

Yes.  This particular moment was a big part of what made Halo so incredible.  

3rd Gen: When I got home with my new shiny NES and popped in Super Mario Bros. It was like discovering a new dimension.

4th Gen: Donkey Kong Country. The SNES had been out for a while and when I finally wanted one and got it for my birthday it didn't come with Mario, as I had expected, but instead this weird monkey game. So I felt a bit disappointed at first but once I started playing it blew me away. The visuals looked really advanced for it's time, the music was great and the gameplay was on a different level from what I was used to.

5th Gen: Super Mario 64 certainly was an interesting experience but it was Legend of Zelda: Ocarina of Time that really blew me away. At this point I had started to lose interest in gaming but something drew me back in and I decided to use up some money I had saved on a Nintendo 64. Super Mario 64 came with the system and was my main reason for getting the console, but I also got Mario Kart 64 because it looked really fun. Then, for reasons I don't remember, I picked up a third game: the newly released Legend of Zelda: Ocarina of Time. It's strange, because my only previous experience with the series was Adventure of Link for the NES and that game had kicked me in the nuts and stolen my lunch money. It just wasn't a pleasant experience for a small kid with very limited gaming skills. But I got Ocarina of Time and boy was it good. It took me many months to conquer but it was magic from start to finish. This is the game that made me go from casually playing games to becoming a true gaming nerd. Ocarina of Time is by far the biggest moment in gaming for me and, sadly, I don't think anything will top it.

6th Gen: This one is a bit more difficult but I'm gonna say the first village in Resident Evil 4. Sure, I was stunned by the visuals and the game is freaking amazing but it is the improvements to enemy behaviour that made this game so interesting and intense. Think you can climb up a ladder, knock it down and be safe? Nuh-uh, the enemies will just raise the ladder again and climb up after you. Long gone was the enemies in Perfect Dark whose best party trick was a weird side-way jump. Enemies were getting smart and it excited me greatly.

Eternal Darkness with its fantastic atmosphere and sanity system was another contender but in the end I had to give it to Resident Evil 4.

7th Gen: This is even harder. Ever since Zelda made me her slave during the 5th gen it has gotten more and more difficult for games to really impress me. I just don't get those giant wow moment anymore that gives me more tingles than any ASMR session ever could. Playing Wii Sports for the first time was awsome, and made me want a Wii (Twilight Princess certainly helped as well) but motion controls didn't wow me as much as my first steps into the 3rd dimension. The aiming in Metroid Prime 3 sure was great and these days I can't live without motion aiming but it didn't made me drool. So I'll give this one to Xenoblade Chronicles. The story was great and it was fun to play but the greatest highlight was the environments, the games huge and beautifully crafted locations. And they did this on the Wii! Squeenix had tarnished the Final Fantasy series by following up Final Fantasy XII with whatever XIII was and here came Monolith Soft to the rescue showing how it's done. They should've had these guys make Final Fantasy XIII.

8th Gen: No clue, really. I guess I'll hand it to Nintendo for how impressively they destroyed the successor to the Wii and the Wii brand. Gotta give them credit for that. And I suppose Donkey Kong: Tropical Freeze was fudging great and showed that side-scrolling platformers still could kick some serious butt and that Retro Studios still had the ability to make stupidly good games. It was also highly impressive how so many could ignore that masterpiece but on the bright side the Switch port of Tropical Freeze seems to have done well.

Now that I think of it, looking at my Xenoblade Chronicles X playtime was also a wow moment, probably bigger than the ones I already mentioned.

9th Gen: It took a while (20 god damn years) but I finally had another Holy mother of God-moment worthy of many songs. Yeah, I'm talking about Legend of Zelda: Breath of the Wild. I have to admit that I was slightly worried that Nintendo, with their limited experience with open-world games would deliver a Legend of Zelda game that, while good, would suffer from the same emptiness that made the big locations in Twilight Princess somewhat boring. That didn't happen and instead Nintendo hit a home-run, like ten times in a row. Breath of the Wild is such a well-crafted game and not only a sign that the Legend of Zelda franchise is healthy and in good hands but also that Nintendo is back and ready to play. Breath of the Wild is an important moment for fans of Zelda, of Nintendo and of games in general. And most of all for me.

Mattel Intellivision : Advanced Dungeons & Dragons, Sea Battle, Lock 'N' Chase.
Commodore 64 : Fort Apokalypse, Impossible Mission, Mr.Robot, Jump Man, Commando, GHOSTS 'N GOBLINS!
Amiga500 : Another World, Flashback, Defender of the Crown.
Playstation : Tekken, Tekken2, Ridge Racer, Need for Speed, GT1, Formula One, Oddworld:Abe's Oddysee, Crash Bandicoot, Metal Gear Solid, Tomb Raider, Pro Evolution Soccer, NBA Live 97, and so many others.
Sega Saturn : Sega Rally, Virtua Figher2, Nights Into Dreams.
Nintendo64 : Super Mario 64, Banjo-Kazooie, Goldeneye 007, Star Wars: Shadows of the Empire.

to be continued, I'm tired.

PS2 fighting someone in fight for New York, with submissions turned off, applying submissions anyway to show him, once a leg, arm, or neck is. broken, the HP drops to red, for the KO.

I'll probably come back later and make another post about other moments right now it's too early   and my noodle didn't wake up with me

Gen PS1: first time I played Battle Arena Toshinden

Gen 7: the heist of the prologue of GTA V and "Bower Lava Lair" music in Galaxy 2

Gen 8: of course the Chaos Blades. No body can't even pretend it's otherwise.

PS4 gen: GoW—the entire game, but one of my biggest wow moments in any game or movie or show ever was the fight with The Stranger.

PS3 gen: Tie between MGS4 and Uncharted 2–especially the intro/train scene.

PS2 gen: I skipped much of this gen, but RE4–whole game blew my mind, partially bc seeing how far games had come. 

PS gen: Syphon Filter. Game was engrossing from start to finish for me. Cool story, cool gameplay, etc.—well, to the 8 year old me at least.

Gen 3 - Super Mario Bros 3
Gen 4 - Starfox
Gen 5 - OOT
Gen 6 - GTA3, RE4 and Metroid Prime are tied for second
Gen 7 - Last of Us
Gen 8 - God of War
Gen 9 - Zelda: BOTW so far

Note: No gen arguments as I class NS as Gen 9.

Pokemon Yellow - "Oh cool I get to keep them if I catch them"

Zelda OoT - felt like a real world.

Smash Bros Melee - It was just so fucking good.

Oblivion on Xbox360 - Gave me very similar feelings to OoT on the N64.

Xbone reveal - Simply astonishing how much a console launch could be messed up. Wii U baffled me too, but not that much.

Switch reveal - Skyrim on a portable, and it's a Nintendo portable? I am now officially living in the future.

Even though I don't use my Switch portably, there have been several games on it like FAST RMX, Doom 2016, Wolfenstein II, Mario Odyssey, and Outlast II where I've stopped and thought "holy shit, we live in a world where THIS runs on a portable device."

It still blows my mind as I grew up when portable games looked like this:

And now they can look like this: