I have to disagree with you on just about all the acting. The only brilliant acting came from SMG, the rest were, at best, ok. The storylines, where they existed, were predictable and kinda boring. I don't see the the complexity or "realness". To me, S6 plays like a reality tv show because everything seems completely set up, just like The Bachelor.
I know or know of as many Spuffies who despise S6 as love it. When I visit the boards, one's Spuffiness does not seem to predict one's feelings about the quality of S6.
What does seem to predict is whether or not you see your life experience protrayed in S6. Those that do, love S6. Those that don't, dislike or ignore it.
Another predictor seems to be when one started one's career. Those who started well before the Great Recession seem to truly dislike S6. Those who started their careers during or after seem.to be much better disposed towards S6.
Personally, I think S6 is where BTVS dropped off a cliff. The quality of the writing is way, way, way down. The stories don't really make much sense. The characters just wandering around and through various pits of despair does not make a seasonal arc. Buffy stops being Buffy and becomes trauma porn. The trauma and misery don't serve a story. They are just gratuitous and shocking just to be shocking.
I still can't explain what the point of S6 actually was. I agree that S7 was a dumpster file. But, S6 was a dumpster fire that burned much more brightly.