it's been said, again and again: Finish the Fight. But this time, they mean it.
I, personally, also loved Halo 2. Though many would agree that the ending was sub-par, I still loved it. The music was by far the best improvement. The music tells it like it is. Halo 3 is an amazing combination of the best parts of Halo and Halo 2. You can see it in the levels, the layout and the environments are a good combination of Halo and Halo 2, indoor and out.
Halo 3 wouldn't live up to its name if there were no vehicle sequences that make you feel that your laying waste to these aliens with total abandon. The game gives you exactly what you need, air support, armor, and fast attack that make taking on a scarab the best parts in the game.
The 4 player co-op makes it all better. On the right screen you can have the best time even if the guys are sitting next to you and not online somewhere else. This is the most perfect example of a sequel I've ever seen
It's been said, again and again: Finish the Fight. But this time, they mean it.