That one map that you hate and do horrible on. Mine is Memento. I am temped to leave every time I get it.
Edit: Top ones seem to be cathedral of dusk and memento.
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I hate all maps that are huge, where I am exposed in the open lots of times, where enemies can come at me from like 150 different directions, where people feel the need to pull out their -blam!-ing sniper rifles, where I always feel like I could get killed by a -blam!-ing sniper any moment.