Niggles: Diablo 3....yes i bought it at launch too :/
*stares at my D3 and D3 expansion CEs* *avoids eye-contact with everyone*
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Regrets:
RE6 (even as someone with a high-tolerance for bad games picking this one up on sale was not worth it at all)
slacker-backing Dreamfall (was away from gaming for awhile due to various factors and never received a gog key... contacting later netted 0 replies)
Watch_Dogs (had some fun with it, but primarily used it to keep comp heat raised when a fan bearing took a shit in my psu and was loud as fuck; to maintain my sanity)
Too many indies and indie bundles to list
Mirror's Edge (motion sickness is a blast)
Legend of Grimrock (fuck spiders sooooooo much)
Amnesia the Dark Descent (the motion blur and shit is horrible)
Dead Island (even my love of gore and zombies couldn't bring me to finish that game)
Soul Sacrifice
Banjo Kazooie gba game (idr the title)
Assassin's Creed Revelations (that franchise nosedive)
Paper Mario Sticker Star
Notable mentions:
PSP and games (has some good titles, but most is mediocre as hell... the gems barely made it worth it)
3DS at launch
Wii U (if not for a couple truly great games and the ability to play Metroid Trilogy without paying some asshat 100's I'd really regret it especially with the way Nintendo has been sabotaging it since the NX was teased/mentioned)
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That said considering the sheer number of games I've purchased, pre-ordered, and played there really haven't been that many regrets in the grand scheme of things.