It's not because it's 2d it just isn't particularly good 2d imo. Seeds of Chaos, Our Red String, What a Legend and Sanguine Rose of the top of my head all have 2d and are superior art wise. I love the game, gave it a 5 star review but was underwhelmed by the art. Porn is also a big part of TLS and other RPGM games, TLS just has a lot more going on with it and the porn is not the most important part investments are obviously
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The review is legit as it's useful for people with a similar view to them and I don't think it was done to troll or shitpost. As for not been a fan of RPGM games but still playing them I'm no different in that regard tbh. I've disliked most games in unity but I still have found a few I like. It's usually not a good idea to just avoid an engine full stop because you will find a few that you like but you don't know that until you've actually tried it.
I get what you're saying but they did play it and it's not like they could've got a good feel for the sex scenes beforehand. The images on here don't show the text or how the scene flows for want of a better term and you wouldn't know it's just 1 image with text over it without playing or how relatively infrequent scenes are. It's just something that's inevitable on a porn forum some will play the more gamey or story heavy games but may not find them fappable enough so a low review gets put on it. It's not wrong, malicious or unreasonable it's just them looking for something different than most fans of TLS like about it and their reviews will represent that. Reviews shouldn't just be made by people that like a game or share the fans views of what is important about it, reviews need to come from people with differing viewpoints.