I loved that movie, and will say that I totally fell for the a...hole Ethan Hawke. He was damaged and mean, but I felt like ultimately he cared and came around. And she fell for the bad boy. I don't think they'll get married, but I fell for that kind of guy once, and loved seeing it work out (I was not as lucky!).
I totally related to them. The angst, all of it. Watched it recently and couldn't tear myself away. And the beginning of video mashups and Ben Stiller really not getting their life and lifestyle, which was much more my lifestyle (still probably is) - I thought it was spot on. She wanted to like him, but they just weren't going to see eye to eye.
Just my take!