I think it is fair enough that people are disappointed when the Developer is saying they are going to put all these things into the game and then at the end of the day they don't. There aren't really any consequences to not doing certain things in terms of your effectiveness in the battle against Corypheus. Even upgrading Skyhold was simply a cosmetic exercise with no impact whatsoever. I kept thinking it was going to be like in ME2 and the final battle would be at Skyhold, so whether you upgraded or not might make a difference at least to whether everyone survives.
The decision over the Wardens was odd, because they implied it could have an impact if you kept them with you, owing to the fact they might still be susceptible to his influence, but that came to nothing. At the end of the game it was apparent that the only negative consequence was associated with banishing them; if you didn't they were never a danger, you got extra war table missions and they ended the game being more open and working with the people of Thedas. What also annoyed me was that I never intended it to be a permanent banishment or that it was to turn people against them across Thedas. It was a banishment from Orlais while we dealt with Corypheus or at least that is what I thought it was meant to be.
It was a similar thing with the decision over whether to take the mage or Templar path. True taking one prevented you from taking the other but ultimately it made absolutely no difference to the battle with Corypheus and the only real difference in the world was that if you went with the Templars there was a lot less red lyrium around the place, particularly in Crestwood area.
However, I would also suggest that the end result didn't just turn out different from what was promised at the alpha demo but also from what seemed to be shown in the original trailer, with Morrigan's voice over. In that we had the veil/sky tearing open (not just a hole in it) and what appeared to be fire raining from the sky onto a fortress. It looked much darker and grimmer, there was the Inquisitor shown struggling through a dust storm, plus Morrigan talked of standing against the dark or leading the world to its bitter end. Still I live in hope that we may still get this at some point because that great tear in the Veil looked very much what Solas says he is planning, whilst the large threatening dragon at the end makes me think of a dragon god, possibly a released Evanuris. What makes me doubt is that rather peculiar decision we were asked to make in respect of Solas; when someone is threatening to destroy the world surely the only thing you are going to be worried about is stopping him?