I figured I would add my experience after loading a bunch of games over the weekend.
I'm running a Mini 1012 HD that I just picked up from AT&T. Aside from updgrading to Windows home Premium 32bit, and removing the bloatware, I'm completely stock.
Starcraft 1 and Brood War- Plays fantastic, even with all the settings cranked. I forgot to check resolution, but I know I had it on its highest setting.
Portal- Medium settings and I believe I had it on 800x600 res. Plays good, but gets a little skip when you first blast a portal. Playable.
Unreal Anthology- I can play the original UT and GOTY cranked right up, and smooth. UT2k4 was on all medium settings, and played smooth.
I'm loading up the rest of Orange Box tonight, and Starwars Battlefront as well.