The problem I've found is the algorithms for detecting taste seem to struggle greatly the further ones taste deviates from the norm. I find Netflix's recommendations to be fundamentally useless and is always reccomending things in which I have zero interest. But I've also found Rotten Tomatoes to be borderline useless as well (the second worst film I've seen in the last decade--Snowpiercer--has a very high RT score...go figure.)
Do you actually rate the things you watch on Netflix? Or go back and rate a bunch of popular movies you loved and hated? Because if you don't, you will just keep getting the same mainstream recommendations.