I have this model, and I'm playing Starcraft II on medium detail setting and ultra textures with no problem.
Only problem is that the cpu can get pretty hot after you're playing a lot, sometimes even 90C, but this is safe since
the it's sandy bridge with the turbo boost 2.0. Also, I'd recommend getting the model with i7 processor. It has 2
additional physical cores(so 8 cores total due to intel hyperthreading technology), and it costs only 50-100$ more.
As a conclusion, unless you want to pay a lot more money for a better gpu (nvidia 540m or 555m) it's a great choice.