times I've considered rewatching GOT, but I just can't because of how disappointed I know I will be.

It sucks because there are so many amazing episodes. I would watch the Battle of the Bastards again and again. That show is completely ruined because of how lazy the ending was.

-The minimization of the white walkers after building from the first episode (think of all the runes, flashbacks, Hodor--seriously so much build up to be then done away with a simple stabbing of the leader).
-The battle at the capital city (can't remember the name right now) where the Golden Company and all the crossbows are obliterated by an overpowered dragon. Again, so much build up with no payoff.
-Bran? Seriously?
-The Dothraki Horde not mattering at all. All these seasons of figuring out how to bring the most powerful army to Westeros, only to be destroyed by the White Walkers.

These are all just off the top of my head. I really hope the last book(s) (if they are ever finished) change everything.