Well, I can't say I've ever watched much Buffy or Angel, they just never struck me as something I would like.
But I'm a HUGE Firefly fan. Hey, maybe it's not for everyone, and certainly nobody HAS to like it (or else!). Give it a chance, see if it is your cup of tea, and leave it at that.
Seems some people are going into it NOT wanting to like it. Well, ya can't please everyone I suppose.
But let me say this: Most shows take a season or so to take off and get good. In my opinion (YMMV):
B-5 season 1? Eh.
B-5 seasons 2-4? Awesome!
X-Files season 1? Not bad.
X-Files Season 2 to whatever? Excellent (ok, it did lose some at the end there)
ST:TNG season 1? Horrible!
ST:TNG later seasons? Pretty darn good.
Briscoe County Jr? Ok, that one was ALWAYS good! I'm still missing that one.
Anyway, Firefly was really good in my opinion and had GREAT potential to become even better. It's too bad the way network TV works shows don't get a chance.
If I had a dime for every show I loved that died before it's time, I'd...well, I'd have a crap-load of dimes thats for sure!