Not a MP person myself, but here are mines:

Highrise - from Modern Warfare 2 (Yeah, even with those assholes snipers shooting from side to side)

Jacinto - Gears of war 2 (The Gears of War 3 map didn't have the same vibe)
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Checkout - Gears of War 3 (My favourite map ever; neither big nor small, balanced and the best matches I've had were in this map)
Also the desert map of Counter Strike, I don't remember it well.







