I don't really have a problem with heel turns being 'unoriginal', but I do enjoy ones where the heel has a valid point.
Christian not liking his treatment at the hands of Teddy Long. CM Punk not liking the fact a drug addict gets so much love and adulation. R-Truth being pissed off that 'even Zack Ryder has a shirt'. Rikishi doing it for the Rock... ah forget that one...