What's your favorite main series Halo game?

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Halo Reach.

I feel it had the best AI and level design, seeing the fall of Reach was awesome, and the final chapter and ending (especially the "Objective: Survive" epilogue) were the finest hour of the whole series in my opinion. The way it tied so beautifully into the beginning of Combat Evolved was brilliant.

As the final Halo game from the original developers it was one hell of a swan song.