Looking back I have a few problems with the episode.
Firstly I will admit that my disappointment at this episode is mostly because I thought that we'd get Stannis this week, because when people talk about the battle at the wall that's what I think of, not the assault on castle black, don't get me wrong I enjoyed that chapter of the books but it's pretty small in terms of material. So I presumed that the amalgamated battle's at the wall would also include Stannis's counterattack. So I did enjoy the episode up until when I realized it was going to cut out. it's more of a retrospective dislike!
I just think it felt stretched, with generic action and filler scenes revolving around central moments ie. Ygritte dying, the assault on the gate. I also felt that while I enjoyed the fighting in the yard (the filming was incredible) it lacked direction, I mean one moment the Wildlings are charging around everywhere overunning the NW and I thought at any moment would break into a building and kill Maester Aemon, then John kills a few of them and Styr and it's all over, it just seemed a bit silly. Also it kinda contradicts what Jon says to Ygritte last season about the wildlings lacking discipline and each one fighting and dying like a hero, as in the books the nights watch use tactics and very little open battle to defeat them whereas here it was kinda every man for himself. Nittpicky I know (Sorry)
Lastly small complaint but why an injured Alliser couldn't have ordered Jon to go kill Mance, I don't know, it's again with Jon doing the things he's averse to in the books (blocking the tunnel, treating with Mance) himself. I would've preferred that to another Sam and Gilly scene
P.s I thought that Tormund would escape but I'm predicting that he'll now take on Val's role in Dance next season
p.p.s Sorry this is such a long rant.