Oddly enough, I like that she looks like she's growing into her costume. It makes her look more like a teenager to me -- I can sure sympathize with having clothes that don't fit *quite* right.
*nods* I'm hoping she'll show more of the "crazy chick" aspect later, though I doubt it based on stuff he's said in interviews. This Supergirl will almost certainly sell better than Kara as she's been depicted in earlier issues, but I personally don't like her as well.