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I actually liked ODST best, but that was probably because of how sweet the automag is. If you're not digging the game now, you probably won't like the way it plays, because it's admittedly very formulaic, right to the very end, as you must always find a squadmate, regroup with them, fight off Firefight-style waves of Covenant, and then you move on to the next mission. If you don't like the Firefight, then I recommend you move on.