First of all, it´s just a GRAPHICS topic discussion ok? It´s not about gameplay....
In the last 3 years 2k lose hands of 2k series in graphics....IMO.
the lightning for NBA 2k11/12 and 13 are really poor and looks like more "cartoonish"....
Look this screens for 2k9 and 2k13:
Look this amazing colors and lights for 2k9, its more photo realist, more like real life... eyes and textures for 2k13 are terrible....
I will post more pics if you like it.
Sorry my english.