I've seen Kats tear up faces in non-crappy games at better-than-average elo. I don't think she's as bad as people say. She just requires some creative thinking because she's not a farm-to-30mins-and-rape type of carry. She pretty much needs to be running around constantly.
Kat is a balanced champion in that the damage she puts out is incredible if the other team is bad.
the problem is that doing well with kat relies more on the opposing team being bad(IE, they dont CC you the instant you pop your ult) than it does with you being good.
--
"First thing that crosses my mind: I didn't get any GameFAQs Karma yesterday." Math Murderer after getting his appendix removed.