If It Ain't On The Page ...:
"I think the script really rocks but what if it doesn't? David Mamet wrote something interesting in his book, On Directing Film. After you've gone through certain criteria to establish whether your text works (structure, scene dynamic, pace etc) you are left with one criteria - how the hell are you able to judge whether the work is good? Mamet then says you have to ask yourself the question: Do you have good taste? Interesting question, huh?"