Worst Game you regret?

GTA IV. The ragdolling pissed the shit out of me.

 

The new Halo Master Chief Collection. Didn't deliver what they promised at all. Was so disappointed not to be able to play my favorite game at it's full potential.

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I've regretted tons, but this one was probably my biggest recent disappointment. Nothing was as promised, controls were shit, graphics weren't what I'd hoped and the interfaces were clunky.