As always, I love your MOCs. I'm actually jealous enough that I've pretty much determined I can't vote for it, because it'll probably win anyways. I'll try not to be biased though.
Probably my most favorite part is the head. Using just a few pieces, you made a very cool looking wolf head, even if it doesn't have eyes. The ears are very nice piece usages, and now I really wish I had some of those parts.
Next up would probably be the color scheme. Even if you say 'it's pretty basic,' it still works magnificently to make him look like a noble warrior of the wolves. There's just enough purple in there, and I like that silver is the main color, which really lends to the wolf look.
And of course, you always know where to put pieces. I would have never even though of that awesome back design with the pistons, Metrutoran chest, and the Minifig arms. Everwhere from the minifig hands on the upper legs to the Exo-force robot arms and Bohrok teeth under the chest is just brilliant.
Other details I like is I'm always partial to that gauntlet look, the belt looks cool (another piece I need to acquire), the claws are cool looking (although they could be spaced a little bit, or angled or something to look more like paws), and overall the armor looks great.
Now, let's see if I can sum up some critique. First off, I think the chest is a little bit flat and square. He looks kind of robotic like that, and not as organic. Maybe if you could add in a little more curve with those Matoro shoulder pieces into the arms. I don't know though, it's pretty close to what I had in mind. Maybe just move it back one stud? (after the contest of course)
I'm not sure about those greebles on the shoulders either. All the rest of him is either smooth or had larger greebling, but the shoulders are a mess of small pieces. Maybe just put some armor (even System pieces) there to cover that up, and it would look a little better. It could also help with the boxy chest.
This one is mostly opinion, but I would like to see kind of that three-part leg design most animal MOCs have. It's not as original, I guess, but it just makes it look a little more beastlike. Of course, it is supposed to be humanoid, so that may not need to apply. Whatever you think.
Best of luck in the contest!