Aishwarya and other Actresses?

Hey Guys,
This forum is great. I live in Canada and I've just recently started watching Bollywood Films and I really love them. 
I've noticed a lot of you seem to really hate Aishwarya Rai.
She's really popular here, where other actresses who I love like Rani, and Preity, and Madhuri get very little attention.

Can you guys help give me some background, and tell me why some of you hate her? And why you like the other actresses better?