This.. is very impressive. I'm surprised by the staff- long have I tried to make those two blades look good together on a weapon, and failed mostly; here it looks natural, the shape the blades make flows well.. And that goes for the rest of the MOC too.
It's bulky, with little gaps. It's got a mechanical flair about it with all those tubes and gears and the tires on the arms. It's solid, and really the only part that doesn't look it are the elbows, but I imagine that's just because of fexibility issues. Any more bulk, the lower arm wouldn't be able to move.
The area around the head worries me, visibility issues for the guy and all, but it looks really cool all sunken in, surrounded by armor. The Mata-Nui blades on the sides work kind of like the end of a battle robe, and I like that a lot.
MAN, I talk too much. But, the creation is way too cool, so that justifies my rambling