Porn games are great. They are a lot more engaging than standard porn, and with a good story you can really start to feel for the characters and get invested more emotionally than you ever could just watching porno.
There are plenty of downsides to porn games as well. First, the great majority of porn games suck ass. Whether it’s the art that some neckbeard drew in his basement, or the shitty coding by a bunch of Pajeets for $1/hour, unless you’re playing a popular hentai game you are going to have a frustrating time. Having to download the shit is a pain also.