RE4 springs to mind. Older popular games I played before I knew how popular they were (RPGs particularly) so I can't count them.
Not a popular answer here, but World of Warcraft and Diablo 2 also. Back when Arthas/Diablo were in that same 4 pack in the contest, I specifically remember making fun of Blizzard fans in an IRC channel I frequent. The truth was that I had never played either game and simply perceived them as bad due to their popularity, and the fact it was cool not to like WoW especially.
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