I just watched the finale the other day. I enjoyed it, and the season - lots of twists and turns. Still, I'm a bit disappointed at Butcher's "turn," though I totally understand it - it's in keeping with his character's motivations. I don't want to get too much into real world politics, but it's really impossible to talk about this show without at least mentioning it. The more overt political stuff - which is the main reason for the review bombing - doesn't bother me, though I think they would've done better to keep things more subtle, and not introduce "real world" references. But, as I mentioned in another post, I think the creators may have felt their message wasn't getting to a lot of people. Even if it was clear to some of us what the show was about from the beginning, some people obviously didn't understand and got offended when the show started making it more clear this season. There were some character developments that irked some people too, some of which I get, but I felt, like with Butcher, they were pretty much in keeping with the characters.
I'm hopeful that the final season won't disappoint. I haven't really gotten into Gen V yet, so I don't know if I really need more stories set in the same universe, but I'm at least open to the idea.