I am still making my way through single player mode. I am probably near the end and the game is rather under whelming. Halo 1 was so much better. The brutes don't provide much of a challenge compared to the elites in the other games...then again I am playing on easy but the AI should be better than it is :P I played a bit on heroic and did not notice much of a difference. I just wanted a really lazy play through the first time :P