1) The terrible quality of gaming "journalism" nowadays (basically every reviewer is a fanboy by now)
2) Lack of local multiplayer on the HD consoles (seriously, why can the Wii handle 4-player splitscreen but the HD consoles can not?)
3) DLC (can be cool, but most DLC is already finished before the game is out, now that's screwing your customers)
I hate the above things with a passion. To be honest, it makes this generation the worst of all for me.