Well except those comic book writers who got fired from Heroes really frakked the show up by paying more attention to gimmickry than consistent characterization, confusing and annoying the audience and pushing the Nielsens off a cliff. As much as I slam Stargate writers, at least they keep characters essentially consistent, if static, from one episode to the next. So writing for comic books doesn't strike me as any guarantee of quality or even minimal competence.Scalzi has also written comic SF, which is promising for the new series.
I think what was meant (judging by the stuff you didn't quote) was that he has written comic SF as in "ha ha funny" SF, not comic books as you inferred.