I agree that everything felt a little rushed, and we know from previous interviews with the writers that they definitely had a lot more story and worldbuilding than they could fit into 13 episodes.
It’s not my least favorite season, as that dubious honor goes to season 5. But I do think it suffered from some pacing issues due to the shortened length, and I also think the big endgame was a bit of a letdown after five seasons of gradual build-up.
But given where they were at the end of season five, and given what time they had to work with, I still think it was a strong season overall, and it was full of moments I enjoyed. It will never be one of my favorite or most memorable series endings, and it certainly wasn’t how I imagined it ending…but it fit the tone of the show, in a weird way.