It has all this potential that is needlessly locked down, poorly presented, and rarely showcased. Once I saw and started playing with the guts of the system - on the DM's side - it was amazing how much my games improved. It was also amazing how I didn't need to make much effort - just a little - to really get the system singing.
I agree with that. Quite the opposite of 3e, 4e responds extremely well to tinkering. It needs to be released from the strictures that were needlessly imposed on it by (eg) consistently poor published adventure design.