Marathon has nothing to do with evading claymores. They were fixing the lightweight avoiding claymores iirc, but the only 2 perks that avoid claymores are hacker and Ninja. Not like claymores weren't easy enough to avoid anyways. I for one wish we could have more special grenades in MW2, most underused/useful thing in the game. Again I play search 90% of the time so Ninja will be m main perk, just for silent footsteps, let alone the avoidance of claymores and the cameras etc.
Also to the person who asked about the blackbird, CoD wiki says that it provides real time updates (I assume akin to auto UAV in private matches), as well as the orientation, and can't be shot down because of it travelling at Mach 3 and constantly moving or something.
XI Wiki



