the main source of the problem is just the pacing issues, imo. the previous seasons mainly focused on one book per season whereas for this one they were trying to condense the best part of two books into one season.
it's lead to the show becoming more focused on tackling large plot milestones rather than addressing some much-needed characterisation (stannis, sansa). they could have benefited from some longer or even more episodes.
plus dorne didn't help his season's case whatsoever
