several ratings per movie
It would be good to have several ratings per movie.
First of all, when I do an assessment I can provide it for how good the main movie idea is, or scenario is, how good the actors play and others. Things that always are the same for all movies. Because sometimes it is a brilliant idea but a bad scenario or bad actors.
The second one is the assessment main actors. It could be helpful sometimes.
Another is really helpful in choosing what to watch - assessment per tags added. Like how much it fits comedy or other attached genres.
For example: when you would like to see some comedy you will never choose a movie that has 1 star comedy and 4 stars drama.