well i just finished it, and it ROCKED, last level was amazing, won't go into details but it was so dramatic and cannot see why people would be moaning about the ending, thought it fitted the end of the series very well - JUST REMEMBER TO WATCH THE CLIP AFTER THE CREDITS - is all i'm going to say.
Loved it, loved every 2nd of it, miles better than any other fps game out on the 360, story, music, suspense - everything, was sad actually when it ended and i know if you love Halo you won't be dissappointed.
How many hours would you say it took you?