You need neither excuse or blame him, this isn't anything new..
Relatively young (back then), skilled, competent, overly ambitious, with quotes aplenty showcasing it. Wants 'disruptive' and large audience, simultaneously (also quoted on that), times have it that's AMD for him; again, back then.
Be it entirely a budget issue or only partly one, ie with himself to blame as well, this doesn't happen; he expected more people on his team, more money, more time (and in part, we can excuse him for that, it's not like the graphics dpt of AMD is anything stellar to begin with) and he wasn't given much/any of it.
Enter one more hop, to the next opportunity for him to be what he's always wanted to be; 'disruptive' + affecting the millions. Bonus too, they pay a hell of a lot better, plus they're offering him a cool new title, appease his ego a bit. Thus the jump.
Neither the first nor the last person with megalomaniacal tendencies, excused or otherwise. Sole difference is the era, as we saw it occuring through "twitter", pseudo-professional "blogs" (lol) and "instagram".
Minus the drama (fanboys included mind you, some of you had a part in this)? Like i said, nothing new.
And nothing to tell us whether he's as good as he thinks he is or not. In situations like these, there are so, so many factors, you just cannot know. I know he must be good enough for a colossus like Intel to not only hire him, but elevate him this high up; that i do know.
Also, he was hired right before Intel started shifting its focus; this must have affected him, hence the latest "compute"-centric hints he's been letting. We gonna blame him for that too? when it turns out it's not for "gamers" after all?
You don't get this high unless you have said tendencies. Excused, or otherwise
Nothing new minus the way it's perceived; overblown now, and with plenty of drama on top for good measure. Soshul media, we all have rights, etc. He is who he is.
(btw, while you're here flaming or supporting him, he's probably earning millions. How much do you earn? Just to put it all under perspective, lol)