Halo 2 is a great game, that really builds on the best parts of Halo CE. Better story/writing, new features (dual wielding, playable elite, boss fights, etc). One thing that I would consider a negative (but not really), was that the Arbiter missions, in my opinion, were so much more fun than the Master Chief missions. The story and lore had more depth and the ability to use invisibility was much more fun than the MC's flashlight. Overall, this has been my favorite Halo game so far (H2A, Reach, HCEA)