So played a little Battlefield 3 last night, and on the lowest settings its a bit choppy. Turned down the resolution to 720p as well, and for some reason it won't scale to the whole screen. Other games will at lower resolutions, so not sure why BF3 won't do it.
Guild Wars 2 is totally playable, so are lots of Steam games, and I'm trying more as I go along.
That being said, I'm pretty impressed with the performance, and I know this nor anything else similarly spec'd won't play the latest and greatest games, but its still been pretty awesome so far to be able to get stuff running on this PC-in-a-tablet form factor.
Gonna download Dead Space 3 and give CoD4 a try.