Just got it today.
Sadly only had time to play enough to get thru the first couple check points.
In that little amount of time though it was clear to me that this Halo is a vastly improved game compared to 2,3, odst or Reach. It will definitely rival the original, and I might go as far as to say it could possibly even be better
And im speaking strictly Campaign here, I havnt even gotten to the Multi player yet.