I play Diablo 3 on med/high settings on my wife's laptop with its HD4000 and 2nd gen i5. Starcraft "runs" in medium but low is where it needs to be at for fluid gameplay. Rust runs on low low low lol.
My actual computer will be at my house tmrw. Got a brand new Lenovo with a 4th gen i5 and a GTX650 w/ 1TB hard drive and 12g ram for only $600. I plan on upgrading the PSU and GPU eventually but I imagine it will be a sizable upgrade from my wife's laptop
