It depends on who's wearing it. Someone like Vinylgroover would look fine, but hairy old fat men in FL need to give it up already. I like to see guys with a nice ass show it off, speedos do it well! But rules should apply to who wears a speedo, just like rules should apply to women wearing bikini's...just take an honest look in the mirror, if you look bad, find something else to wear! I wear a one piece.
Same thing goes for muscle t-shirts (wife beaters). If you don't have the body to look good in one, please leave it at home!