These are fair points, that I have no real argument with, but I do have a different perspective.

• Tastes vary widely, especially when you try to start trying to throw a little humor into the horror mix. I genuinely enjoy watching some things others really hate and conversely can't stand to watch some franchises that I know are actually pretty good.
• I freely admit that I enjoy cheaply made horror and movies that makes big swings and take wild chances. Sometimes that works out. Sometimes it doesn't. Sometimes even the failures open the door to something else. The Alien franchise might have taken a really different direction if James Cameron didn't work on Galaxy of Terror (a low budget mess of a movie that I don't recommend to anyone that isn't seriously into bad movies the way I am). Even though I don't like Galaxy of Terror enough to repeatedly watch it, I'm grateful for the insight.
• I think the trick really is to find a reviewer(s) whose taste align with yours. For example, I enjoy watch Brandon Tenold's takes on cult movies on YouTube. I don't always bother to find and watch the movies he reviews, but after watching his take I can usually get a good feel for if I'll enjoy it enough to spend the time and effort to find and watch it.
• My time for movies, shows, and books is not precious and limited. If I start watching or reading something that I'm not into, I'm okay with not finishing it. There's no reason to torture myself over it, I just move on. I don't consider this a waste of time.