I don't see the reason to hate any of the original cast....well, Cordelia needed not one but SEVERAL slaps around the head, but she got better over time. That and most guys liked her because....to quote another writer, "she's hot and has a great ass"!
But again, her character got better thankfully, just wish it hadn't taken so long.
I admit to being a big Jennifer Calendar fan, but again that's partly because she got killed too damn early, and to please the Oz/Willow shippers (as it was originally planned to have Angelus kill Oz). Now Oz....again, I don't particularly dislike the guy, and Seth Greene is hilarious, but I never really got the Oz character.
Now, IF we were to start moving on to some of the OTHER characters, say Season 4 and beyond? Oh dear....
Riley was FLAT. I mean come on! I get it, Hollywood, but clearly the writers never really spoke with a lot of veterans and knew just how "unique" military humor is, or just how sarcastic your average veteran can be?
Dawn....yes, christ almighty, she was annoying, but no, they just wouldn't kill her off, would they?
Glory....I guess she was supposed to be annoying for a reason? But she was annoying to the point she wasn't funny or all that great a villain at all.
The Nerds....they would have worked best as one of the "monsters of the week". But then we got stuck with Andrew....yes, I wanted him dead too. What a waste of space.
And finally, it should be worth noting....Kennedy. They should have killed her in the beginning.
Geez, guess there's a lot of characters I wouldn't have minded seeing dead, but at least they're just supporting characters.
P.S. The "Initiative" idea as a whole and just about everyone associated with it was BEYOND stupid.