I always get my Buffy seasons confused. But I did rather enjoy it "at the time".
Season 1 was 'ok', but it didn't get into it's stride until Season 2. I can remember finding Drusilla captivating - she is still one of my favourite villains ever. And "Becoming" was genuinely moving. Season 3 was absolutely amazing - I adored Faith, and I loved the Buffy/Angel relationship.
Season 4 was crap from beginning to end (pining Riley, Adam, the crap Uni life), with the exception of "Hush" which is probably the best Buffy episode. The finale with the whole 'first slayer' crap, was quite the opposite.
Season 5 was good up to the point of Joyce's death, after which the show became so morbid and introverted. After that point, it had a few flashes of brilliance ("Once More With Feeling", Anya's one liners etc.), but from then on i think they just went too far. They brought Faith back and ruined her character, they killed Tara (why?), and the whole of Season 7 felt taxing. The headmaster dude was a lame addition. Spike and Buffy's love/hate relationship was self indulgent crap.
And i hated Angel.