I think they can be done well, I can suspend my disbelief enough even when it's using obviously recognizable porn stars. The place where it falls apart for me is when different actors are used for the same character just to suit the scene. That's no bueno.
Real porn games are the biggest wastes of time and even bigger pieces of shit. Also they don't even use niche videos and actresses. They use the most mainstream well known actress and fucking brazzers videos and then write their shitty story. Like dickhead I know this video and as bad as the acting is that story is better.
I like the concept, but most of the time it's riddled with bugs and the same clips. I get that people are trying to make money, but 99% of the times it just seems like a money grab to make such a game
90% of them is just insanely low effort. It baffles me that a developer using real porn in an html game uploads a 100mb first version that takes 3 min to play through. I don't know what they expect from something so barebones. I will say Gateway and secret taboo are two exceptions.