1. You can blacklist uploaders who mainly upload stuff you don't like (in settings) 2. You now can hide tags you dislike, and watch tags you like (configure it in "my tags") 3. Galleries with some tags (like guro and scat) should give you a warning before you even see anything, if they don't you disabled it
Ratings don't affect the system in any way (besides users filtering by rating and missing out on a lot of content by fetish-hate design) so don't worry too much about it. Thanks for sharing Nanashi Genmu!