Nah, I dont think the feet look clumsy or flimsy, I think its that the shoulders and forearms are sooo big, that maybe it can give that illusion, but really his body is well proportioned, the legs to torso i mean (arms are big but thats the point right?) the rotary psi blades is an interesting idea (maybe not very protoss like, but cool non-the-less) i think you captured the concept art imagery of SC wuite well here. Well done, how bout some marine variants?
Yeah, the Terrans are way cool man, and your so good at robots you can pull it off with easy flare, you like aliens alot (we know) but do some more people like your sgt with the crazy ass mohawk-style. Cool yeah!?
Very nice! I'm trying to get some 'toss down at the moment, and that's damn cool. The hands are awesome. As for the feet they usually have a sort of two-toe setup (since they've got two largish toes). As long as he's fairly agile and got good balance (as a zealot should) I don't think it'd be a problemand I'm sure their armour's not as constricting as the Terran power-suits so he should be 'right.