Watching him in interviews I think that Eric comes across as an affable and pleasant enough guy.
Except for the blaming....
John this....
John that....
"Oh dear! I'm blaming him again!"
No real attempt made to burden his share of the responsibility for the train wreck that was Trial of a Timelord for starters. Only moaning that John backed out on the cliffhanger ending.
Yes, he is entitled to his viewpoint that Colin was miscast, but he turned to Colin for advice at the time and breathed not a word to him.
His work since Who has been patchy to non-existent. He could have got his act together with Big Finish, or written a thinly disguised novel about his life or something, but no....
His early stuff was actually okay in many respects and it must have been a growing nightmare for him, trying to commission good scripts that would then be arbitrarily vetoed by JNT for no good reason.
I think where he went wrong was in latching onto Caves of Androzani and deciding that a whole season (22) with a similar grim, gritty, casual death filled tone was a good idea. It wasn't.
Then Trial was, I thought, a lazy idea from someone who wasn't really bothered that much. He should have left at the end of 22 imo.,which he admits himself.
Sadly, for himself and everyone around him, except Ian Levine who was lapping all the drama and attacks on JNT up, he did not.