My problem with some seinen animes are how edgy and how much they try hard with all the "adult" scenes. The older I get, the more I think that gratuitous sexual or gore scenes are more interesting to teenagers, or maybe that's just me being overexposed to that kind of content too early.

Of course like anything else, there are good and bad , regardless of its demographic groups. I have all-time-favorites from all demographic groups (shoujo, shonen, josei, seinen) that are close to my heart. Vice versa, all of them have their fair share of meh stuff.