Hes semi mechish right? Even if he isnt. that stiff area in the crotch, the armor plating area moves too much when he runs, it deforms and all.

Also his arms move in stages, first upper part, then the elbow, so on. It would be more realistic if they all move at once.

The head could use a little more movement and the back bend more, and tuck the elbows in a little. But its good for your first rigging.