My third year going and I got to play a lot this year.
Super Mario 3D World: Graphically appealing, the graphics are great. Seeing it in person does the game justice, not saying that the trailers doesn't do a good enough job, but it's much more visually appealing in person. I think I played on of the first levels, and I got paired with a girl, a lady, and her son. Of course the girl only really need to play, she was a gamer after all, the other two were dead weight. It plays similar to 3D Land and the controls are easy to get used to. We got to use the cat suit, but I'm not too used to it, the mechanics of it feel awkward to me. Overall it was a solid experience, and what you expect, stomp, stomp, stomp get to the end of the level. You also can collect green stars and collect more time to explore the level. I saw the water level they've been demoing a few times in the trailer, and its beautiful.
Donkey Kong Tropical Freeze: Plays exactly like Donkey Kong Country Returns. The Nintendo rep had us play with the Wiimote and Nunchuck and told us in the final version you'd be able to use just the Wiimote. Anyway, we did the boss battle, and surprisingly enough, the boss didn't die in three hits. It's the walrus from the trailers, and he slides up and down the ramp, and you have to time your jump and jump on him. Eventually he sends fish raining from above, and you have to either dodge them or jump on them to kill them. Once you get halfway through the fight he'll become more aggressive and start sliding up and down the ramp faster, and he'll summon more fishes and his pattern changes. Overall I think it took 12 hits or maybe 10 to kill him. It's a solid experience, stays accurate to the DKC series.
Sonic Lost World: It's great, although I'm not a fan on Sonic, I'll definitely get this. It's definitely what you expect from Sonic, going fast, homing attacks, trying to beat the level as fast as you can, collect stuff. There's also some levels from older games (Sonic Colors). It's definitely appealing, but if you aren't a fan of the series you probably won't like it unless you're thirsty for Wii U games.
Bayonetta 2 was surprisingly playable and it's outstandingly beautiful in person. The game is definitely fast-paced, there's no denying that it's not 1080p 60FPS. I didn't get to play because of the lonnnnng line, but its definitely a game worth checking out.
I played Watchdogs too and it's pretty cool with the Wii U gamepad. I couldn't touch stuff like The Legend of Zelda 3DS game, Mario Party, etc because of so many people but they were there and Nintendo had the 3DSs hooked to a 15 or 12 inch TV so you could of seen the gameplay even without playing firsthand. Pokemon X & Y were there too along with Mario & Sonic ATWO2014.
Microsoft and Sony didn't have any presence at the conference and there were no PS4 and XBONE demo stations from what I saw when I went around twice. Overall it was solid fun and I can't wait to do it again.