It really pains me to do this because there are so many reasons to like this game.
The problem is that The Banner Saga simply doesn't deliver what it promises.
At the very beginning we are informed that at our decisions affect the game: THEY DON'T. Despite the fact that they've created this vast and gorgeous world, steeped in lore and history, you can't even choose where to go. You're firmly 'on-the-rails' for the entire game. Occasionally, you get text based encounters where you get to make a decision, but having played Banner Saga a couple of times, I can tell you that most of these change nothing. Sometimes one character or another dies, but it's trivial since they aren't really necessary anyway.
At the very beginning we are treated to a beautiful animated cut-scene complete with voice acted dialogue, so you'd figure those would come up at key points in the game at least, right? THEY DON'T. Not even at the end.
As the story develops, more and more layers are revealed: The gods are dead; the sun has stopped in the sky; there's a prophecy; there's tension and intrigue between characters and races, etc, etc. NONE OF IT GOES ANYWHERE. In a nut shell, the story is: survive until you get to the end boss - who has practically nothing to do with anything.
The artwork is gorgeous, the concept (Viking Oregon Trail + Turn Based Strategy + Some RPG elements) is simple but it works. But instead of using that simplicity to really open up the world, we're instead treated to a vast tableaux of untapped potential.
Maybe they're planning a sequel - and heck, I've put this many hours in already, I might even pick it up - but honestly, if a game leaves you feeling, "What, that's it?" It failed to deliver.