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Lone Survivor is the easiest by far. It's not a game that really involves skill per se, and if you really get stuck there are guides that will get you pointed in the right direction.
Guacamelee is short as rjmhart said, but it does have some sections that require a modicum of skill and/or patience. It's a blast to play though. --- PSN is same as username. Please do not send me blank or unsolicited friend requests.