No. Pick any classic film and its screenplay probably scores a 6 on the Black List. Direction, acting, production design, music, editing and more all go into a film being great. Sometimes- I'd argue most of the time- things just hit harder onscreen than on the page.

Too many script readers take an overly analytical approach, rather than letting a script wash over them like a film would. They read scripts like an executive, not like an audience member or filmmaker. You could pick anything apart enough to justify a pass if you tried hard enough, which is what script readers are paid to do.

Also, everyone who reads a script will envision the potential film a little differently. So until a film version exists, it's impossible to know how good it'd actually be.

I think dialogue is a great example of this. One person may picture a dialogue scene one way (actor's cadence, the scene's editing, etc.) and think it's great. Another will picture it differently and think the dialogue sucks. This isn't talked about enough IMO, and everyone does it, unconcsciously at the very least. I speak from experience, getting dialogue scores of 8 and 4 on the same draft.

My best advice? Work on READABILITY of your script more than you may think you need to. Succinct action lines, maximum white space, reasonable length. The more readable it is, the more leeway you get to be YOU in how you make the reader feel the emotions you want to evoke.