Even with low expectations I too was really disappointed. I just can't get over how poorly done the story is and how little risk there was to create something new. As a diehard Halo fan from the beginning it's really disappointing that after the conclusion to Halo 3 and the potential there was to create something new and fresh they still have you fight covenant for most of the game. And there is zero explanation as to why your fighting them, or why they decided to ally themselves with didact. And yes I know they explain that stuff outside the game but that's poor storytelling to not have the game stand on it's own. Also it's downright silly for Chief to be in crosleep for four years and never ask anyone why the covenant are still a threat. And then the music was just super generic Hollywood music with zero soul or personality.