Now that it's done, I think the big mistake was shortening the season. All of that could have played out a lot more dramatically and understandably with a regular season. Even Dany's death -- that should have been an episode in itself, with Jon needing convincing, and some kind of plotting about how to do it, when to do it. Instead it was just too easy, like everything else has been (hello, Night King).
I'm on board with where everyone ended up, more or less, but they really screwed up some chances for actual tension and drama by giving us endless shots of people walking. Tyrion walking toward the castle, or whatever. Jon, walking toward the castle. Arya ... Ugh.
And tone was so weird -- like someone said on Facebook, I think, the ending shots were pure telenovella romance, and so was Dany's death and Drogon's rage, but then they switched gears from this high fantasy to an almost too realistic (for values of realism that include dragons, I guess) epilogue where you've got the cleanup and rebuilding, and Bronn snarking and Tyrion sighing. All of which could have worked on its own, but smashed into one episode was a little jarring.
Also, the moment Sam invented a republic was a little TOO too for me, much as I love him, and I just can't buy that the group of nobility assembled there took seriously 30 seconds to chuck their entire system of government for electing whoever without a single argument. Bull. Shit.
Arya's end was really anticlimactic, too. I'm all for her going off to see the world and have adventures, but in this episode she basically walked around, said goodbye to Jon, and laughed at her uncle putting himself forward as king. Not satisfying.
My other real criticism was the jump from Dany being carried off by Drogon to Tyrion being led to the council of nobility. I don't know if I missed something, but they did not make it clear that weeks had passed, so it took me a minute to catch up.