It's so funny that the only anti fan site of Kara you can find is from my country, Vietnam. That forum has 55 member and only 3 of them are anti of Kara, all the rest will be Anti of SNSD if not Kamilia )
Most of anti fan will hate Gyuri for her confidence but i think that personality really suite the leader role. If you watchKorea shows, i bet you will hardly tell who is the leader of SNSD, T-ara, 4 Minute ... But for Kara, it's sure Gyuri
Another reason for hating kara is they overact cute. Yeah, many people will think that the first time they saw KARA but they didn't know that's KARA's real character, we love them for that reason