Sir Ackbar of the Night's Watch watches Season 7

True. But in a story I expect a more satisfying end to such a lengthy subplot. I assumed he would lose at some point, and I always thought Brianne would probably kill him (because they kept reminding us of her desire for vengeance) but to just have him fail and die after a battle we didn't even actually see felt anti climactic. I'm guessing his storyline was really just an elaborate way to set up the Red Woman, and her role will ultimately be far more important than Stannis.

I would have simply settled for a "what have I done?!" moment after he failed. Maybe some remorse/regret about his family. But we didn't even get that.