Console: Kingdom Hearts 2

Close Second: Almost all Zelda Games

Handheld: Any REAL Pokemon game 

The Best Ever 1. Zelda: Ocarina of Time or Twilight Princess My Favorite 1. Red Alert 2/ Yuri's Revenge Most Revolutionary 1. Wii Sports

Hey! This isn't the "Duckman the Adventure game" thread! Your title is a lie!

The Legend of Zelda: Ocarina of Time

1. XenoGears 2. Final Fantasy Tactics 3. Golden Eye 4. StarCraft 5. Metal Gear Solid

I'd have to go with the original Tomb Raider. Perfect level design and music.

Final Fantasy VII and Metal Gear Solid 3

ouch, tough one.

Probably... Starcraft.

EDIT: No, Homeworld. Great game. 

Zelda OOT (N64) Nothing really needs to be said. This game and FF7 were equally awesome IMO, I was just so much more impressed by OOT because it has such unreal immense hype that no game could actually live up to. Yet it still managed to do just that.

FF7 (PSX) The demo of this game sold me a PSX.

Goldeneye (N64) Me and my buddies logged over 100 hrs of multiplayer in this game easily.

Suikoden (PSX) Seriously one of the most underrated games ever. Found this game laying in a corner scratched beyond all HELL in my friends room. Borrowed it as he clearly didnt care and beat it. Then beat HIM until he played through it too.

FFTactics (PSX) My first SRPG. Loved it. Delita FTW.

Mario Kart (Snes) My most played SNES game.

SSB (n64) I laughed when the rumor first surfaced that Nintendo was making a fighting game.

SSB  (GCN) I wondered why I ever doubted Nintendo could make a good fighting game.

MGS (PSX) This game is like 5 more hours of gameplay away from stealing number #2 on my list. It was FAR to awesome to end so bloody fast. FAR to awesome. Best story telling ever IMO.

World of Warcraft (PC) Played for about a year.

Dark Ages of Camelot (Played, from release until WoW launched)

Sonic Adventure (DC) Hey this game had online world rankings that had some kick ass prizes man. You guys missed out if you didnt compete. I even won one of the contests, a USA only one. Sega sent you certificates and free first party games as rewards!

Quake 3 Arena (PC) My first REAL introduction to online gaming.

Double dragon 3 (NES) Ahhh to hell with angry nintendo nerd. That game was fun.

Bust a Groove (PSX) I loved that game. Only game Ive ever been sold on after playing a demo in a store. Played demo > walked around > found game, bought game. 

I was gonna go over this and correct any grammatical and spelling mistakes but err TLDR. 

Manhunt. I know the game had clunky controls, but just the idea of placing a bag over a dude's head, then to lay in a few before snapping the neck is just insane. Yeah, I love gory games.

Oh, and Virtually Jenna is right up there too.