Nintendo: Deceptive localization practices. We should be past this sort of childishness at this point. Atlus makes its living almost exclusively on obscure Japanese localizations, you can do it too.
Microsoft: Deceptive advertising. You do not have Madden as an exclusive title, quit making it look like you do.
Sony: Arrogance. You can't tout every year as the year of the PS3, and you can't claim you run this industry.
Monster Hunter: pissing me off since 2010.