legendary is easy in halo 3, especially once you've played Republic commando on elite difficulty...it's so damn hard! i used to get crushed or eaten alive by trandoshans!!! omg!
back to the subject.....^^, Halo 3 on legenday is apparantly easy to me....although...i can't find any of the skulls!!! i found one skull on the last level, you could carry it around and wack the complete ^%$#!!! out of all the flood....but it didn't unlock anything which was a bummer