the problem with dbz cosplaying is the fact that,weather you love it or hate it, it is a graphic lacking show. Trying to translate it into real life is easy and by nature people tend to take the easy route.
No that said, i have seen only one "good' Goku and it was only in passing. He went out of his way to do those little things that enhance it . He didn't use a foam wig but glue styled a wig, he was actually in shape, don't care to count how many i have seen of those. and he acuity wore the thing like he meant it. I can't begin to express how important that is. Sometimes i have seen people wear dbz and act like they are ashamed that they are there in that cosplay.