I've tried hard to minimize spoilers I see while still watching the series. In what has leaked through my defenses, though, I've seen that people are upset that certain characters did super-important things that didn't make sense for their characters but served to tie up the story quickly. It disappoints me the showrunners chose to do that. I'm planning to write about a similar problem in my next GoT blog, regarding Sansa Stark's character development in season 6.