Her face
There is something off-putting about her face. I can't figure out if her eyes are too far apart for her face or if her nose is just too big.
She is just a goofy looking broad.
Her nose is not shaped in a way that is "traditional" for a pretty girl.. and a lot more guys have that kind of nose than girls... I didn't like her at first, but she grew on me. I personally think I am attracted more to her fashion than her face though. Overall I think she's really hot!
I disagree with whoever said she puts Chloe Moretz to shame though. I like both Bella and Chloe, but Chloe is waaaaaaaaay hotter in my opinion.