Professionalism is a big part of it. If it's clear that the writer didn't put much thought or effort into the work...I don't care for it.
What else do I look for? Well, it must be a compelling story (or scenario, for a short "vignette"), with characters that ring true
. Established characters must be recignizable as those characters, and original characters must be handled with similar integrity. Compelling, authentic--that's the thing.
And dialogue. I must admit--I'm big on dialogue quality. If it clinks, I turn off. If it's great, I can forgive a lot. (Helps explain why I'm so forgiving of X-Men Origins: Wolverine
, but despise Star Wars III: Revenge of the Sith
like you wouldn't believe. Dialogue