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I think for me that would be a not too standardized plot, as can be seen in most movies . Often movies of a certain genre show quite some simmilarities, so after a while you can predict the plot. I'd like it if the plot stays somewhat unpredictable.
Apart from that, the actors need some basic acting skills (I could name some that lack those and need some serious training xD, or they're just not suited for a certain role)
Music is important, because it makes or breaks scenes
And of course, an interesting subject is welcome aswell

There are probably lots of other points to mention, but these were the ones that popped up at the moment