heres my top 10 (if i remember them right):
10. halo 3, master chief and arby checking out the crashed flood ship (high charity), the opening was just amazing all silent
9. halo 3, the gravemind the voice that apears throughout the game which shows cortana wierd stuff
8. halo reach, night of the solace, flying in space jumping around in low gravity. alot of fun
7.halo 2 ending, cheif what you doing on that ship
FINISHING THE FIGHT. stuff of legends
6. halo CE the final mission was epic a mad race to the finnish then the cutscene showing chief taking of the mask and just as he doing that end.
5.halo odst dropping for the first time
4. halo reach carters death, heroic death, why people say its pointless? its one of the best
3.halo 3: escaping on mongooses/waterhogs/ghosts. the way halo is just collasping and you are just like HOLY S$&T, WTF and the final jump
2. halo reach, noble 6: the way he is just like taking out multiple elites and kicking, punching his way to survival, his helmet of and elites blocking his face. elites eventualy overwhelmed him and got energy sword (but there is a chance he survived.
1. the halo campaign itself in my opinion on the top 3 in the world (1.mass effect/halo (hard choice) 2.mass effect/halo 3.crysis (so far what i know stuff of legend))