What is a series finale many fans disliked, but that you liked - or the other way around?
When it comes to a series finale that I actually really liked or felt satisfied with but others didn't, my answer has always remained the same for the last several years now. And that is the series finale for Battlestar Galactica. In fact, my opinion hasn't really changed all that much and the more I've rewatched it, it's actually strengthened my love for the finale. It wasn't the most perfect ending, and I'll admit there were things I wished had been handled a bit differently, but it was one that felt the most narratively satisfying, at least to me.
Without giving any spoilers away for anyone who hasn't watched the show yet, I will say that overtime I've come to understand the reasons why some didn't like it. I think the latter half of the last season was overall quite divisive for many fans, mostly due to us waiting an entire year for that second half to come back thanks to the delay from the writer's strike at the time, and within that time RDM ended up readjusting the way he wanted things done for the grand finale of the show. I think this really did divide fans and the series finale didn't help matters. I knew that it wasn't going to please everyone, no finale is going to do that, but I'll admit I was surprised by how so many fans outright hated it. And while I don't know if it was a direct result of that, but the fandom started to quickly disappear after the series was over, to the point where you barely see anyone among the current fandom circles talk about BSG, which honestly breaks my heart.
This was sort of a long-winded answer, but it's something that I think about constantly.
As for series finales that I hated that many others loved, I can't really think of anything at the moment. Mostly because the majority of my shows end up getting cancelled before they get a chance to have a proper finale, or if I ended up disliking a finale usually many others did too (ex: the HIMYM series finale, the entire last