I think the main thing that bugs me about Aeris is her hair. What's with the puffed-out bangs? That's Sephiroth's style!! I definately like Tifa better than Aeris, because she has a better attitude about everything. Aeris always whines about some small thing every minute of the game. Also, I think that Tifa is definately the right girl for Cloud. They've known each other since childhood, and Cloud saved her arse during the nibelheim incident. They're made for each other! Aeris kind of steps in out of nowhere...blah...
That's how I'll describe Aeris. "Blah".