Halo 1 - GREAT Campaign Mode and set the standard for multiplayer forever.
Halo 2 - My Favorite Campaign, and the multiplayer is very action packed, fast paced, and also needs stategy.
Halo 3 - Not as good of a Campaign if you ask me. But by far the best multiplayer when it comes to graphics, new weapons and tools. Plus has the most custimation when it comes to making a spartan or elite.
