Nice work, really love the piston ribcage. The top half of the head is kinda reminiscent of the robots from Elysium, but the rest of the body looks distinctly rectangular and industrial, whereas a lot of movie robots these days go the route of having ridiculous amounts of spiky edges and unnecessary gaps in the armour. This however, is the perfect blend of realism and sci-fi, possible yet awe-inspiring.
What makes this robot awesome in my eyes, is that it's... bulky and mechanical. It's trendy now to make robots all shiny, artificially muscled and what not. This one here is different - built to serve its function, not for the looks. This gives him that realistic feel which brutally reminds that it is machine without feelings of mercy, hesitation or pity. Great work.