Well, I don't think his pirate comics were ever that popular. He was mostly known for SYAC.
The thing about SYAC is that it's deceptive. It seems like an innocuous enough strip, perhaps something in line with Kevin Bolk's work.
But as you read it, you realize that it comes from a very nasty place, and that Dobson's over-inflated ego is poisoning his work. On top of that, he's just ignorant about a lot of things.
So he offended people, and the trolls smelled blood in the water. So they poked him and prodded him until his dark side came out.
But yeah if you scratched the surface he was always a piece of crap.