Nintendo ruins the potential of the gaming industry with their constant desire to reiterate themselves for the sake of nostalgia instead of truly innovating on anything.
PC gamers ruin the potential of the gaming industry by focusing so heavily on minute graphical differences that they're willing to let actual gameplay suffer for the sake of visual enhancement.
Microsoft is ruining everything by buying up companies left and right (usually at their lowest moments) and micro (pun intended) managing the f**k out of them for the sake of profits over innovation.
PS balances all of these better but suffers from poor communication with its fanbase and not being able to advertise their services effectively. Also their online stuff is always behind, but I'm mostly a solo gamer anyway.