I like the Buffy/Angel storyline, but when the big moments weren't happening it seemed to get pushed to the back burner or just got repetitive. Even then it only really got good when Angel turned bad and Buffy had to kill him. Otherwise it wasn't much more than you'd find on Dawson's Creek or some show like that, except it involved a vampire.
A Vampire with a soul falling in love with the Slayer is a nice story, but I just didn't feel they used it to it's full potential outside of the Angel heel turn. Everything besides when Angel was evil fell kinda flat in my opinion.
I still got into the end half of Season 2, but I'm sure I would have liked it even more if I was into their relationship when it happened, but by that point I was annoyed by it sometimes.