I can name so many that goes down the path of tedium, boredom and far too multi-directional. If that is a reasonable statement.
At times, the Author/Creator either loses or had poor vision for their creation, and sometimes too grandiose than it should be. Far too often do they also cater to too many groups of each distinct desires, diluting the other content in favor for more of other content, rather than focusing on certain content and only implementing what would harmonize or be cohesive with the existing focus.
I could go on. But Nebel is the case of "I am so fucking bored and tired. Give me a savefile, and let me see the CG/Scenes." situation. That is when you lost it, as a Creator. To not have incentive to play it at all. And that is why i prefer my Pixelated NTR, minus some of Agus titles. Gotta look for those scenes. But that is just me.
Headpat being one that makes pretty good NTR and content right now. Unfortunately, the friggen Community there has started pushing to cater to their selfish desires, despite there has been NO Voting from the Creator, for content the Creator thinks would be cohesive with his vision. I tire of people in general...