Simulators, complex strategies, shooters, MMORPGs, adventure games, full blown racing games..simply typical big pc games that get thrown in to retail boxes.
What I see in metro store is bassicaly mobile games and XBLA ports. Of course it does make sense, as those are the simpliest and least demanding ones, as well as their touch-controls friendiness, which is the main point of Metro. I mean, if you're making traditional pcgame it kind of doesn't make much sense to bother with porting to WinRT unless Microsoft pays you to.
I guess I'm tiny bit bitter here, because I love pcgaming and there's no company in the last decade who did more harm to it than Microsoft. Which is sad for a company that for the two previous decades did more good to pcgaming than anyone else around. As a plus side, they at least stopped treating pcgamers like morons, who will swallow any BS they throw at them, which is how various Microsoft reps acted just few years ago. Nowadays it seems the message MS has is "we don't care about pcgaming directly, what we do is just provide tools for companies who do", which is fine by me.