I'm not the biggest gamer. Nintendo has specific games that Microsoft and Sony haven't quite been able to match yet, like anything in the Mario series, Zelda, or Super Smash bros. Those are fun games I like to play.
Not only that, but Sonic games typically come to Nintendo, sometimes there's an exclusive (like Colors or Lost World). I don't really play too many other games, except the occasional game, like Rayman.
After that, I stick with PC, seeing as most games I may be interested in will come out to the PC. And with Steam and their sales, I don't have to pay much to get a lot of content.
I'm not a big fan of FPS games. I can recognize that the Halo series is pretty good, but for an FPS, I have any option on the PC (TF2 being the only one I play).
Bethesdia games come out on PC, Ubisoft, SEGA is releasing PC versions, and so on.
Skullgirls was originally out on XBLA, but I knew it was eventually come to PC. (Most of those sorts of games are likely going to come to Steam, though)
The games I typically only miss out on are great games like the Team Ico games.
I don't have an issue with some games not making it to WiiU because I already don't care about them from the beginning.