In 2017, Switch got a lot of great AAA titles that set the tone for what owning the system would be like. 

-Breath of the Wild, Odyssey, Skyrim, Doom, Xenoblade 2, Mario Kart 8, Rocket League.

The AAA titles of the Switch so far of 2018

-Wolfenstein 2, Fortnite, Pokemon Lets Go, Super Smash Bros Ultimate, various WiiU ports, Octopath Traveler, Warframe

By sheer numbers - Switch's 2018 offers a lot more content by individual title count. But what about something that gives me an open world adventure really worth pouring dozens of hours into? 2017's Zelda, Mario, Skyrim, Xenoblade really had that to offer. Doom had a pretty extensive single player as well.

2018 by contrast is very multiplayer heavy. There's also great single player games on deck, but most are shorter. Lots of good cheap fun but nothing that would really make for singular, extensive experience worth going back to for weeks.  Octopath - as great as it is - is an acquired taste. Hollow Knight nearly gets into AAA territory, but gets too grindy in small 2D spaces for my taste. Really left yearning over here for another 3D AAA adventure game on Switch in 2018. Maybe I'll feel differently about that if I got Wolf 2 on Switch - but what after that? I seldom really go more than 10-15 hours into a Pokemon game. Smash will be great - but that's an endless time sink, not an adventure.

For Switch to round out the year well, I think it really needs another great 3D AAA adventure style game or two with the same scope of Zelda, Skyrim or Xenoblade. I think that's why so many were upset at E3 2018 because we really hoped Metroid Prime 4 or Bayonetta 3 would come forward to scratch that itch. I doubt we really get either title by end of the year - so what's the best we could hope for in that absence?

For me - It'd have to be GTAV. I actually haven't gotten around to it on either last gen or my PS4. I find it funny - NBA2K, Carnival Games, and LA Noire have made the jump to Switch, but not Take-Two's most bankable franchise.

Or maybe something like Metal Gear, Tomb Raider, Batman Arkham, Fallout 4, Assassin's Creed, Bioshock, or even the other 3D Zeldas or Metroid Prime Trilogy HD I think would cap the year off well.

Are you feeling that AAA 3D adventure game void on Switch like me?

I don't think the Switch severely lacks 3D adventure games, though GTA V is a must, considering how well the Switch has been getting the other basic multiplats. Rather, I still miss the plethora of A-AA JRPGs the 3DS had. I know the japanese studios are slow to move on, but the Switch is such a good fit for the JRPG market I'm surprised we don't even have many PS360 ports.

BotW 2 of course!

I don't think that Switch doesn't really needs any game, but talking about AAA adventure games, Tomb Raider would be cool, but offcourse GTA5 would be single biggest 3rd party game that any system (including Switch) could get.

I would love a remake of Oblivion or Morrowind on the Switch.

I just really need more Zelda on it (The traditional kind). Remaster Skyward Sword, give me a new 2D game, port all the previous remakes/remasters, whatever, just give me something. Also, Square, please hurry up with the Dragon Quest XI port.

Edit: While technically indie, I really want Psychonauts 2 to come to the system as well. I know it's a meme at this point, but I honestly think it's perfect for the Switch.

I'll tell you what it truly needs:

A PIKMIN GAME.

It's been 5 years now :(

I don't think so. The typical serious AAA online/single player games have never been what drives Nintendo's business. Nintendo has always found MUCH more success with quirky titles and/or those with strong local multiplayer.

The problem with most AAA games is that they're not built to appeal to the Nintendo fanbase which has. From the beginning, thrived on the aforementioned two types of content: quirky and local multiplayer - those games that do both (Mario Kart, Just Dance, New Super Mario Bros, etc...) thrive; and these qualities are what generally make up Nintendo's top 200 most successful games. In addition, when these quirkier games are multiplatform, they tend to do better on the Nintendo console while the non-quirky single player/online experience tend to do better on other platforms. If you can get one of the two down, there's a chance that the game will do very well: GE007 is an example of this, although it has its fair share of quirkiness. Most AAA games focus on being as devoid of quirkiness and have poor/limited to no local multiplayer. Look at all the quirky million+ sellers on Wii, DS, NES, SNES, and Switch - the closest thing Switch has to a well performing non-quirky single player game is Skyrim which is 11th.

I don't think there's any reason for major focus in this area. It's nice to have ports of stuff, obviously, but to say Nintendo NEEDS these sort of serious single/online multiplayer AAA games conflicts with what's worked for them for their entire 35+ year history as a videogame company.

Fortnite is an online multiplayer game that I can actually see being a success, on the otherhand, but also kind of a good fit with Nintendo because of its quirkier nature. I do think that it's not perfect, if someone could nail that style of game with an even quirkier nature and local multiplayer, I can see it go really far on the Switch.

And honestly, I don't think big AAA titles is what Nintendo needs this year; what I do think they need are the smaller more creative games that expand the sort of genres and sub-genres on Switch; those along the lines of Professor Layton, Animal Crossing, Barbarosa's Treasure, Muramasa the Demon Blade, Endless Ocean, Rune Factory Frontier, Little King Story, Space Station Silicon Valley, Earthbound, and that sort of game. A lot of the more quirky niche types that work to expand the sort of content that's on the Switch, stuff for people to write about and say "Hey, there's some really cool hidden gems on this console."

As down as people are about the Pokemon game with the random encounter mechanic replaced with something different, this is exactly the sort of game I want to play on the Switch with my wife and kids. I understand it's probably not going to be the coolest game on the fifth grader playground, but I don't give a shit about that, I'm almost 40 =P
Even though I'm not a fan of Smash, that's a great one, Animal Crossing would be fantastic this year, Fire Emblem WOULD have been great if it made it into this year... essentially content like that is what I think this period needs more of. A huge Zelda-caliber game seems to be the sort of thing 2019 needs, that combined with a Pokemon RPG that expands on the original concept rather than making a clone of it could potentially shoot Switch into the 22-25M realm in 2019 in combination with the games that are pushed out of the 2018 schedule.

would GTA V be a great game to have on Switch? yes! will it happen? probably not. simply because the joy-cons do not have analog triggers, and GTA is game entirely centered around vehicles

Due to the fact that i use my Switch only docked, i play on it only exclusives cause i play the other games on PS4 Pro for obvious reasons. Said that, i desire an AAA RPG (J preferibly but even W would be good) action based. Who knows if Sakaguchi from Mistwalker is working on, maybe from them, and as said before it should be exclusive. I'd like to see too a good remaster of Skyward Sword and Xenoblade Chronicles X.
An other game i'd like to play on my Switch is a New Zelda created only for the Switch, improving the little things that Botw didn't do like swimming under water or some bigger villages.