hm - not sure what I think of the art direction. Strange mixture of a cartoony / cell shading touch and realistic styles - if done badly, it could easily look like a shortcoming and not so much like a deliberate style choice.
Not exactly sure what you find cartoony or cell-shading about the game...
Btw, anyone else noticed how the visor is soooo looking like the Tank PA, especially if you consider the WOC PAs?