So I 100% understand the complaints about no Stannis at the end. Count me amongst the people that think it was a bad idea and will take away from the impact of Stannis's arrival. Having said that, I don't get why so many people are claiming Stannis will be breaking up some peaceful negotiation. In the preview Mance specifically says he will kill everyone in Castle Black. Jon also leaves Castle Black thinking there is a good chance he will not return. Yes I do think Stannis's moment may get overshadowed by Tyrion, but I don't believe Stannis will be made to look any less heroic in his actions. The show may have made the watch look a little too victorious, but Jon still made it clear that they are totally screwed. Letting Mance pass through the wall will be just as problematic as it was in the book and therefore, Stannis's arrival will still be very important.