You'll need to play non demanding games with the Intel HD 3000. I tested the Intel HD 3000 in my Lenovo IdeaPad Y470 for the hell of it. It was able to play Mass Effect 3 on low settings (likely Mass Effect 1 and 2 as well) at 1366x768 resolution. It is also capable of playing Fallout 3 after downloading a D3D9.dll file that was originally created for Oblivion in the Oldbilivion project. It tricks the game into thinking there is something like a nVidia 8600 GT card other than an Intel graphics core, but you need to use a mix of low and medium settings.
I would assume you can also play Half Life 2 and many other games using Valve's Source Engine on low settings without much issues like Portal 1 & 2, Team Fortress 2, Counter Strike, and Vampire the Masquerade: Bloodlines. I also assume it can play Dragon Age: Origins as well since it came out around the same time as Mass Effect 1 I think.
You will not be able to play GTA 4, Battlefield 3, none of the Crysis games, Metro 2033 and likely many current games. As long as you keep your expectations low, you should be ok.