Avary also "wrote" the Silent Hill adaptation, lets not forget that. Avary is consistent and Gaiman probably deserves the title of "genius", but Fincher knows what he is doing. Look at his resume, even his "bad" films are gorgeously made. However, the better script, the better the outcome. When he had "Fight Club" and "Seven" material, look at what he was able to come up with. Personally, I'd rather Fincher have a script that lived up to its full potential rather than a half-assed/disastrous one like that of "Alien 3". God knows, with Fincher at the helm this would still be a watch able film regardless.