> but how credible is he as a source if he can't even pass his quals?

Where did he say that?

That is a comic from "PhD comic", for newton sake.

Where did you get the notion that he couldn't even pass his quals? Moreover, what does that have do with the correctness of his complaints.

On an unrelated note, I find it mildly interesting you say it was your "fault" that you weren't cut out for academic research.