There are a few good erotic games made with RPGM. But really only a few. Most of them are extremely grinding. But the biggest minus is that you have to use your keyboard. The older RPG-Maker didn't had a mouse support (there were a few fan made add-ons to fix that, but not many games used that). So if you play a RPG-Maker game that was made with an older Maker, than you have to use your Keyboard with boath hands. Using two hands in an erotic games is a no go. from RPG-Maker MV on mouse support was implementet and you can use it solely with a mouse. But it isn't fun controlling it that way. Especially the menus are programmed baad. You have to klick most options two times, must always go to a special place to go back (in Ren'Py it's just a left mouse-click).
In my younger days I liked to play RPG-Maker Games and even made some myself. Even today I play them from time to time. Some of them are really well made in story, style or gameplay. But they are best played wiith a keyboard with both hands.
Another point I would insert: The extreme difference in art-syles for when you run around on the maps and for the erotic scenes rarely match together. Not an big issue, but an issue nonetheless.
So yes, if I see an RPGM tag, then it must have a big reputation, must match almost perfectly my preferences or must have a very high rating before I even think about looking at it.