I haven't had too many problems with 7. It definitely runs a heck of a lot better then vista did.
I will say some older games are a bit tricky. And if you're like me, and want to hold onto some old favorites, you have some McGyver moments ahead of you. For Example, I got Klingon Academy to work, but the game itself crashes occasionally, and there's always this strobe light effect in the starfeild. The Descent series, I've gotten 2 and 3 to work, but not the first one. Final Fantasy 7 and 8 for PC work, but you have to do a couple of things that make your computer mimic older sound and video drivers.