Wii U has FPS games.. black ops 2 Is out now and plays great. i'm sure others will follow suit. Battlefield is also coming. As far as other "mature" games... I've rented and played assasins creed 3, zombiU, and Madden. Also gotta try mass effect 3. Nintendo is not just Mario anymore.
Also, my day 1 Update only took an hour to download and install. game updates about 20-30 mins. not bad really.. I could do other stuff on the console while updates for games installed.
Yea, you know the Big N has such a reputation as a "cute" console, which with a lot of their titles, it really is.
But, yes, you can get Black Ops, Assasins Creed, Zombie U, etc.
My sister got went ahead and got him an Xbox. That's what his friends have. I have no idea how the Big N is with online gaming. What I do know is Xbox Live is great for that stuff. That's what he wants to do.
He's into The Walking Dead so I got him Left 4 Dead 1, 2 and Blacks Ops 2. He should be in heaven.