Writing is maybe the most difficult of all creative pursuits. There is no momentum. In fact, there are many things actively resisting anything resembling momentum, starting with that looming blank page. William Goldman once said, “The easiest thing to do on earth is not to write” and he was absolutely right.
It’s impossible to say what makes a film great. Useless to prescribe any rules, since often the best films break them anyway. A more helpful discussion, then, might be to talk about what makes a film bad — and what can be done about it (this is the helpful part).