I don't loathe Captured's armor but I don't like it, either. It's sleek and modern, while I prefer the earthy tribal look. If he was some kind of "military/cop" pred I could understand the armor, but from what I'm aware, that doesn't seem to be the case. He does seem on the short side to me.
My opinion on Upgrade's overall existence and the "DNA" plot thing is negative, but I'm pretty indifferent as far as looking at his design objectively.
The idea of predators wearing human military gear rubs me the wrong way. It's hard for me to imagine them lowering themselves to that, and I just don't like how it looks. But I'm trying to withhold judgement until I see the circumstances and context.