Well, thats down to your taste in music - as you all know I love the music from all 3D sonic games - but the knuckles music in 2B is in a different style. It gives me a headache - I find listening to it so frustrating. You know, I always hate the type of gamer who turns the sound off while they play because IMO they only get half the enjoyment out of the game - but it was SO tempting to turn the sound off then. The rest of the soundtrack, as I said, is superb - especially the Tails theme - oh yeah, and the music to the first level.
You said about the storyline of games. Well, in my opinion, one of the best-presented stories of all time is Sonic Adventure. Its the way the story is told by seeing it through so many different angles - and theres so much depth to it its like nothing else. Its told better than any book or any film could tell a story.