I usually only like the female versions of male characters if they are well done. Like for example I saw this super awesome female versions of Mario and Luigi and they even had an obvious guy in a Peach costume with them. That was pretty awesome.
But I don't like the ones where they are overdone like the SNJ Naruto stuff. That's over done. Also the ones that look like they went to Hot Topic and put on a wig for their cosplay. But those are the only things that really bug me.