I know I'm late to the party on a 2 year old thread, but I thought I would add my opinion.
When starting out playing adult games I played a few RPGM games and it actually cause a very negative reaction from me based on the following reasons:
1) Lack of direction. Lack of hints, or detailed quest logs caused you to become lost in the game.
2) Huge maps with little to do. Tying in with Nr 1 would be huge maps. So you would walk around aimlessly for hours trying to figure out what to do.
3) Touching on
Avaron1974 's point. Lack of adult reward for sometimes hours of gameplay.
So I started avoiding RPGM games like the plague.
NLT started changing my perceptions with their two brilliant games (Lust Epidemic and Treasure of Nadia.)
Their first game My Summer with Mom & Sis actually falls into "not so nice to play RPGM game" category. The game was actually not bad, but RPGM detracted from that game. I actually played a Renpy conversion of that game to finish it!
Then more followed. Struggle with Sin, Peasant's Quest, Paradise Beach, Wicked Rogue... etc. etc.
So in my view, it's definitely on a redemption path. I'm still hesitant to pick up an RPGM game, but the good ones are so good, that it surpasses most Renpy Games in my opinion . I enjoy spending time in that world and there's actually stuff to do, BUT the dev needs to know what they are doing. Most adult RPGM games I tried are a bit "meh" for me, but There are some VERY good ones, that now let me have a second look if the game looks good, even though it's on RPGM.