I don't think many people are seriously saying he "didn't do anything". But people are questioning how much credit he truly deserves for EQ, given it's basis in well known MUDs. The design for EQ was largely lifted from said MUDs. Brad is a designer, not a technical guy. He didn't do the graphics, network code, or anything else technical. And it was obvious in the first couple years of EQ that Brad didn't "get" a lot of what was going on with his own game.
If Brad is going to trade on his past, then people are going to raise legitimate questions about the only two games on his resume. One, EQ, there's some question as to how responsible he truly was for the underlying design and whether or not he truly understood his own creation. The other, Vanguard, as a textbook case of gross mismanagement on his part, even if the underlying design was good. Given those two, it's not a surprise that most reasonable people look at how fucking atrocious this KS was from the get-go and keep going.