What I love about this piece is that you really captured the Gears 3 vibe, which was totally different to the first two. Just looking at it makes me want to get on the XBOX and take on the whole lambent and grub army all over again!
I also like your choice of lighting. I tend to avoid the whole back-lighting thing, because it makes it harder to make out details, but it works really nicely for this piece; makes you look around at everything else going on in the piece.
Also, excellent title for this piece; such a Marcus thing to say!