The cell stage was the one I thought would suck, pre-play. Turns out, it's rather dynamic, and interesting. Sure, it's still basic, but it's as good as they could have made it.
The creature stage is okay. I'm bored with the play, but I love the creature development, so it really equals out. I wish they had more content as far as design benefits though. I feel like I'm forced into limited creature designs (if I seek good benefits) or forced to suffer in abilities if I chose designs I think look cool.
The tribal stage is okay. It has all that it needs, but I find it too much like the Sims, where you just execute what you're told to do by your tribe. There isn't much strategy.
The civilization stage is okay. Not as in depth to us Civ players, but not bad either. More content would be nice. I like designing the buildings, but I think it needs a little work.
The space stage is interesting. I like the graphics and the zoning in and out of planets, stars, galaxies. I like how there's multiple mini-stages in the space stage.
Cell > Space >>> Civilization > Creature > Tribal