Sony has a decent amount, actually, and they're pretty much the only one of the three that has pretty much all of their bases covered. Nintendo does okay as far as variety is concerned, but they could use a few more games. Microsoft is really the only one of the three that's severely lacking in variety, as they only really have a handful of exclusives that they actively promote (Halo, Gears of War, Fable, and Forza), aside from those you pretty much have to rely on 3rd parties if you like a certain genre. For instance, my favorite genre is platforming, but you don't really see any platforming games out of Microsoft. There's a couple of them out there, sure, but none that they actively promote. Meanwhile, I have several options for platformers from the other two, Nintendo has Mario, Donkey Kong, Yoshi, and Kirby, and Sony has Little Big Planet and Sly Cooper (and probably more, but I can't really think of any others off the top of my head). Sony spends some time talking about other features for their console, sure, but so has Nintendo (especially recently, they've been pushing the Gamepad and Miiverse). The difference is that Nintendo and Sony also have plenty of exclusive 1st party titles to back up their consoles, Microsoft, not so much.