I think invasion is good fun, though the way Bungie went on about how awesome elites were in it isn't quite right imho, I played 1 game as an elite and the rest as a spartan and well we won almost all our games as spartans. I feel whilst being faster and bigger in close quarters is better the spartans so long as they know how to utilize the marksman class available from the offset well can prevent the elites ever getting close enough to be truly effective. I think it only happened in one match but we actually did stop them cold, the other 4 spartans held the left side of the initial battlefield and myself and Psy held the right side alone, the elites just didn't stand a damn chance.