WOULD a guy wear a mini-kilt?
Yes, as there are pictures here of men in them.

SHOULD a guy wear a mini-kilt?
ABSOLUTELY NOT!!!!! In short, they tend to look bad, odd, and imply negative things about his "manhood." I have YET to see one I think look like he didn't get it from a woman's closet.
Would I wear one?
NO!!!!! NO!!!! NO!!!! (Wouldn't work right anyways)