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I sort of like "The Maw "because at the part when you have to detanate the ship with your rocket launcher I always shoot 343 guilty spark because he pisses me off so much!!!!!
I really like the Maw but nothing with me beats the control room because it's the only level you drive the tank. Also with level you can kill enemy with ghost and banshees(if your quick enough)
My favorite will be the control room. You face a freaking -blam!-load of enemies, and the level mixes awesome indoor and awesome outdoor battles! And, it has awesome music: Perchance To Dream, Covenant Dance, and much more! It is my favorite.