people don't seem to go into detail about it other than saying "brooring not RGPM man"
This is mostly because most RPGM games are made by relative newcomers to game development who (ab)use the default assets that come with the editor. So you get a slew of games which all look and play alike. The other main reason is that game design is a difficult skill to master, and RPGs are probably the hardest genre to develop (losing out in complexity only to something like civilization/management sims).
what would make you play an RPGM game?
I'll take any game for a spin as long as it catches my eye. I don't have enough time to play even 1% of them, but anything that looks interesting goes into my library, regardless of engine. For example, I'm probably going to go through
The Last Sovereign this summer when I get some vacation time off work. That's an RPG Maker game, but it's such an interesting concept and the writing is amazing, so any engine and UI limitations don't really bother me.
And what to avoid in RGPM?
Bad writing will kill your project, and it'll do it even faster than bad art. Sierra Lee's
The Last Sovereign and Toby Fox's
Undertale both prove that you don't need fancy art to make a good game, but you
do need good writing! If you're trying to make a porn game in RPGM, you
have to nail down the writing! If you can't do it yourself (maybe you're more of a systems design person?), then team up with a writer, most of them are pretty chill, and they'll be glad that someone out there wants to feature their work. I'm the writer on the
Crimson Delight Games team, and trust me when I say that most writers are more than happy to collaborate with others.
Also, here's a bit of shameless self-promotion to show you what can be done with RPGMV: