10/10 - Halo:CE was amazing. Whereas its predeccessor's have often felt like they fell short on the single player, Halo:CE was the complete package.... every area of it was 10/10. I wasn't into console shooters... at ALL... and then, same old story, I played Halo at a friend's house, and had to get an xbox for it. Those years are a blur of taking my xbox everywhere to play with friends, set up LAN parties, etc. I'd never had a console game before, and never since that literally everyone I know who didn't have an xbox wanted me to bring it over every time... And everyone who had an xbox would set up 8-16 player game nights where everyone brought their xboxes and TVs over to play. It was one of a kind.
Edit:
It's one of the few games i've ever played that I would genuinely give 11 out of 10, just because it was such a huge leap and a game changer. Along with StarCraft, it gave more multiplayer replayability than any other game I've ever played. (an especially impressive feat considering it wasn't even online)