So basically.. Image quality you will chose in the game, under the graphical settings. Wether its anti aliasin or increased world detail or whatever. No matter what graphics card you have, the image quality will not change. What will change with a newer and more powerful card, however, is how many frames of that chosen image quality it can render per second.
A Nvidia G 210 card can do crysis 2 and the higest possible settings much like a a GTX 590. The difference is that the geforce 200 will give you 1-2 frames per second, while the gtx590 will give you about 60 fps.