You can play StarCraft II on medium graphics settings. As for CPU stuff, keep it on low settings.

4200 integrated graphics aren't that great. My friend has them in his desktop and is like, my monitor is better than yours (which doesn't fucking matter since he's running integrated graphics, fail). It will play SC2, but don't run anything in the background so you can get maximum performance. I even got SC2 running on ATi Radeon X1950 graphics, so anything is possible.

X1950 is actually stronger than the 4200 onboard for gaming, so that doesn't really matter mate. 4200 discrete cards were rubbish, and the onboard version isn't doing it any favours. 
Forget about playing the Witcher 2, unless you want a slide show. SC II will run, but will look quite ugly, esp if you're use to HD console graphics. But it also depends alot on your tolerance. i know some people can game on the pc fine at 20-30 fps. Me on the other hand, can't stand anything under 50 lol.
Overall, the 4200 is probably better though if you plan on watching movies and stuff. But don't think you can complain too much, you did get a good deal for it. So be happy =D

Also slimebeast is correct. The xbox360 is actually faster than his laptop, esp for gaming. 

This guy is right on the ball. Not a good gaming laptop at all: low to medium settings. It is an ok laptop to do non-gaming activities. 

I can play not demanding games @1280x800 res and medium (or even highest for the oldest games) settings on my laptop that's older and slower than yours, a 2GHz Turion with integrated X1250 graphics, so you should be OK for most games. Since even mid-low end chipsets have been able to output at least high res at comfortable frame rates, initially 1024x768, later a minimum of 1280x800, medium and low settings aren't so bad anymore. Even less on a 15.6" screen, where you don't need higher level AA like on bigger screens to make edges look smooth, for example.

Ok so I've played Shogun 2, a bit of Civ V, Starcraft 2, and Cities XL....all of them are on medium (except for Shogun 2 which is a hybrid of low and medium settings) and they run perfectly fine! 

Lovin my new computer so far, it hasn't froze once!!

Lenova is a great brand. :D 

Easily my new favorite laptop brand, my thinkpad=perfect school laptop

Good choice, John! 

How are you finding SC2 the game? Done placement matches?

Lenovo. If you respect the brand, at least give it its proper name :O

Yeah I was gonna go with either a Lenovo, Toshiba, or Samsung.....and the Lenovo was the best price with pretty good features.

I was staying far far away from Dell, Acer, HP and the likes of them.

I've just played the first mission so far (since I have so many other PC games to play) but its a pretty fun RTS.