CE is my third fave, the one I had the most trouble getting through was 2, it was sooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo long (very elongated version of the word "so" added for dramatic effect), that one mission with the tanks, and flood as the arbiter (you know which one) gave me an insane headache. And I have no clue how my friend and I will beat it on legendary...