Funny, I think season 3 is the strongest, followed by 5 and 6. 4 and 2 are weak, and 7 is just... ooc, though I love the sharing of the strength motif, I am not fond of the potentials being dumped onto Buffy or the horrid ways the main cast interacted.
Still, the show touched people and changed lives... it's still changing lives.
As for Angel making the show? BS. Boreanaz was a pretty boy who learned to act on the show. They had great chemistry, but you only have to watch Prophecy Girl to know who the star was, who was strong, vital and busy saving the world, right from the start. Heck, as males go, Xander had more centrality in ep 1&2 -- he and Willow, supported by Giles were Buffy's moment by moment support, even though they weren't the love interest. They were there from the beginning to the end. Angel was important, but he wasn't her life and he certainly did NOT make the show.
Buffy, in the form of Sarah Michelle Gellar made the show.
Buffy's one heck of a character, and Sarah's one hell of an actor. I think they caught lightning in a bottle when they cast her. A failed movie turned into a legendary series. One we're still talking about, in spite of flaws and pratfalls. And no, it wasn't because of Angel, though I don't believe Buffy ever forgot her first love, he wasn't her reason for being.
She started a hero, and became a true champion.
The show wasn't about her love life. That just trivializes it... if this were simply a show for teen girls, pining for their one true love, no one would be talking about it 21 years later. How many shows that started 21 years ago still have the kind of following Buffy has? Theses written about it?
Buffy is so much more than a TV show. It created a whole new universe! I cannot imagine my life without the BUFFYverse.
I love Spike. Other people love Angel. A few even imagine Buffy with Xander, Faith or even Willow... but while the relationships between the characters matter a great deal, it is friendship, not romance that is central to Buffy's survival and growth (as well as much of her pain).
Buffy, the individual, is more than just a girl in love, who happens to fight monsters. She's a complex, funny, smart, amazing character, who survives in spite of the short brutal life fate has planned for her.
Buffy, the series, is a metaphor for life... struggle, growth, transcendence, falling and getting back up again. Becoming.
Angel was a fleeting dream that became a nightmare. Then it became a case of unfulfillable longing. I'm sorry, but continuing that longer than the one season would have been a farcical and unbearable miasma. A 16 year old dreams of her 'mysterious lover', it's all fantasy and giggling with Willow. A 17 year old consummates it, and it works out or it doesn't (it didn't). An adult woman finds a way to make things work, or she moves on. Angel didn't even let 'them' decide. They didn't even consider looking for a cure for the "stay celibate forever or let the monster out" scenario. No, he decided for her, because it was HIS decision to make... which treated her like a little kid (not even a teenager), and certainly not a partner.
He and Joyce getting together and talking, was the adults getting together and making choices for the 'child'. Thank God, he didn't stick around to share that 18th century mindset!
No way was is any of that a workable relationship. Celibate forever? Sorry, that's insanity. No, I am with Faith... sex matters. Particularly, in a young, vital woman like Buffy. From the sexual being we see Buffy become as time went on, she couldn't have been satisfied by just "gazing soulfully into her dead lover's eyes." Then it would become Twilight. (shudders). Buffy was more than that! She needed more than that.
An Angel/Buffy holding pattern would have turned Buffy into a soap opera of unfulfilled desire, that Wes and Cordy mocked so hysterically on his show!
Instead, we got Cordy/Angel holding pattern on his show, once they tried the romance thing, before which, he rocked the monk life and actually focused on saving people. I'm glad he left Buffy. David got to grow into a decent actor and we got 3 great years of Angel, the series. Angel staying would have turned the Buffy series into the Angel melodrama of unfulfilled passions going nowhere, and rapidly stopped being about Buffy or . That didn't happen on his show b/c before the show actually addressed the relationship difficulties, Cordelia ascended and Angel sank.