From the DC Super Hero Super Healthy Cookbook. 1981.
GreenArrowPizza.jpg
60's House ad.
B&B71ad.jpg
Fans can be bad writing fits for characters they very much love, just like some artists love westerns but can't draw a horse.
I get the feeling Williamson is sincere in his love for the DCU. Sometimes he sings (he made me like a Damian solo, the madman) and others he doesn't, but from his writing I can tell the affection is there. He rarely goes out of his way to absolutely dunk on a character in a meaningless way and I don't see any of his characters being too far from standard characterization, though I didn't read his Flash so perhaps I'm missing some egregious examples.
So far his worst sin as a writer that I've seen is that sometimes his work can be very by-the-numbers. There are certainly worse offenses and offenders.
Stretching talent thin is usually never a good sign, though.
I would not turn away if Williamson took over a Green Arrow book. Give him a run then see where the book goes from there.
"Life is too short so love the one you got cause you might get run over or you might get shot" - Sublime