Not many people are capable to work an exciting 30 minute main event period. And I don't think he ever claimed he could (nor anyone else for that matter).
I found Raven matches more enjoyable than most stuff on ECW, certainly more enjoyable 15 years later than overrated "technical" demonstrations of Eddie vs Dean, or nonsensical wankery a la RVD, or horrible boring brawls a la Duds. Way more fresh and more fun to watch. Yes there was ton of bullshit, but it was fun bullshit that worked. Just me (litteraly, since I'm probably alone to still enjoy Raven as much as I do).
Whether he claims he can or not, the question was if he was held back. I don't think he was. Not claming that he's not good at his job doesn't absolve him from responsibility over being good at his job. My problem with him wasn't that bullshit was part of his act. My problem was that if you stripped away the bullshit, he had absolutely nothing left.
Most of ECW is horrible beyond belief (at least from 1993-1997), so I'm not disagreeing with you there.
What Vince Russo is to booking (a bunch of stuff to distract you from the fact that it's all crap) is what Raven is to wrestling.