Personally, there are two genres that I read even though I find them problematic. The first of these is Romance novels: I read these because I love seeing female protagonists and they are most commonly found there. And in general, good Romance novels are pretty decent. They will have strongly characterized protagonists and interesting conflicts. Their downfall tend to be that the male love interest tends to be an awful jackass; and one who takes over the story at that. Still, I find that these books are worth reading because the point where the love interest takes over is generally well into the story, and the early part can still be pretty good.
Isekai stories are a similar tale except that they tend to be much worse. These books are largely written by amateurs with no interest in the craft of writing so it should come as no surprise that they tend to have paper-thin characterization, mostly non-existent plots, and poor world-building. So why still read them? I just pick out the ones with promising premises. These suggest all sorts of wild plots - how can a person with X power / Y disadvantage make his way in the world? And so, these books can be pretty entertaining as long as they can maintain forward momentum. And who knows? There's a chance that one of these books can actually be pretty good.