Here's my list...
Martian Manhunter - I like the cape and boots, hate the suspenders and speedos.
Alan Scott - He looks like a Shakespearian pimp from the 1600's
Triathlon and The Flash - Why they can't wear something close to what Track and Field athlete's actually wear, I don't know.
X-Men - They should bring back the costumes from late 80's early 90's. Maybe then I could consider them superheroes again.
Green Lantern (Kyle) - I don't like his costume, but at least he actually looks like Green Lantern now. That old crab-mask costume was just awful!
Wonder Woman - Dave's post said it all.