Too bad he didn't leave before, he personally destroyed the creditability of the company. Or let someone else design games who had a clue beyond 'shoot, shoot, bang, bang'.
Also mocking gamers and fans who supported id in the early days. Telling them he didn't care what kind of game or features they wanted, he only made what he wanted.
His actions have shown him to be a control freak, who is out of touch with not only id fans but the game industry.
At least there's a chance Bethesda can turn the company into something beyond pathetic. No doubt Rage was an improvement for id but it was still an unfinished mess beyond the driving and gunplay. Not to mention the engine seemed to be a graphical disaster, just like doom 3, at release.
Scorpio Slasher: ... What about you boy, what do hate?
Marcus: ... Bullies. Tiny d*ck egotists who hurt people for no reason, make people lock their doors at night. People who make general existence worse, people like you.