For example if I watch a WWII documentary, then they feel the need to recommend every one they have, for a long time. Oh and "watch" means "seen more than a second or two of", so you get all this crud even if you didn't like it.
Perhaps the biggest sin is showing me stuff I have already watched, outside of the "watch again section". My home screen is mostly things I have seen, and I have to keep scrolling past to see if there is anything interesting deeper in the sections.
It is especially annoying that there is no "do not show this again". My home screen is a collection of content I have already seen, or do not want to see. It makes Netflix look dumb and is very user hostile.
Most amusing is that they don't provide a way of finding content that you want to watch now. For example you would like to watch something funny and light for the next half hour, or a date night movie. Sometimes those categories randomly show up on the screen, but usually not.
I'd go on, but the overall vibe is a very dumb experience of recommendations that I don't want, no useful content exploration, and it feels like I watch stuff despite them, rather than because of them. Maybe I should cancel my account again.