Another thing as far as “look” - have you ever watched outtakes? Rough cuts of scenes in the Special Features section of a DVD? Notice how crappy they look - and they’re a HOLLYWOOD movie?! A truly good film to video transfer, and good color grading are needed even on big budget movies - don’t think they look that sparklingly wonderful right out of the film dryer.
Even professionally shot video needs good color correction for shot to shot matching, as well as crispness and tonal values. Hot Windows allows you to selectively color grade just specific portions - someone’s face to draw the viewer’s attention in a scene, etc.
Straight out of the camera is surprisingly boring - no matter if it originated on film or video.
And yes, like has been mentioned in the other posts above - there’s appropriateness of the angle and lens choice, there’s MANY issues regarding audio that need to be attended to or it just screams “unprofessional”, bad FX or compositing in general, bad mattes, bad acting, etc.
There are plenty of things that will get better with practice, assuming the filmmaker(s) are TRYING to get better. They’ll see what they could have improved, how they could have improved them, and on the next project it will be better.