I disagree with StumpyStrust -- just because you're using 3D to model/animate doesn't mean your game may as well be 2D. There are lots of 2D games that use this technique (Starcraft for example).
I think you mean it should be 3D if you are doing 3D and not 2D and I hope you are referring to starcraft I and I am not sure they did 3d models for the 2d images.
Anyways, I don't claim to be all that proficient in pixel graphics and I am surprised so many people use things like 3ds max and what not. It seems like a lot of work for 2D but then i guess thats how you make great 2d graphics.
I can also say that CS 3 is bad. have not used CS 4 or 2 but 3 is bad. I like 5 a lot.