I don't find Netflix recommendations to be that useful. They recommend categories for sure.. but I like a wide range of movies and it is usually on a per movie basis.
They never, ever admit that they don't have what I'm seeking and then suggest alternatives.
I get it free from Tmobile but hardly use it.
Also, there are a lot of independent movies and TV shows on NetFlix. And they suck. Horrible acting and plot but the cover is sometimes good enough to trick you into wasting time taking a look.
Statistically, after viewing a great movie the next one will be rated as less satisfying. We build up our expectations to a level that is not in sync with reality. This psychological insight was used at one of the early Netflix challenges by one of the top contestants.