I really would have liked more options, as great as the creature creator is , it seems like only those gifted few with a nigh omniscient knowledge of its dark inner workings can truly unlock its potential.
I have to agree that cell stage as a herbivore sucks a little bit, but other than that my experience so far has been pretty much the opposite, I played a barbaric carniverous bug race and a leaf eating bird-thing race and found the latter to be much easier in all stages after cell.
Of course now that I've gotten to space with the peaceful race I'm finding it ever more frustrating to do these other galactic empires bidding to attempt to appease them, I would much rather just blow the shit out of them.