Scene variety may perhaps be a little lacking, but it definitely does play into the 'Secret NTR' that is so beloved. NTR is only partly avoidable and honestly, is way too easy to avoid.
I spent literal hours grinding out the final scenes because you gotta repeatedly go out come back go out come back, and the game won't let you beeline straight back either. Anyway, game's good for NTR content, but not great for too much else.
Also, they never explain any of the lore. Why are there FUCKING GOBLINS IN THE SEWERS
They're tankier than zombies?! Why are we not talking about this? A group of survivors was slain to the LAST MAN by GOBLINS. I don't know if they're actually goblins, but what the actual shit was the whole sewer section.
That aside, I'd say the biggest drawback of the game is the grinding aspect. Not doing it robs you of the story of your wife's slow corruption, which is part of the reason why I play these games, but at the same time, I wasted a whole 4 hours running around collecting so much materials. You need 30k to reach an ending. I had 250k by the end of it because it's that easy to avoid the NTR ending. Most items with actual value in the later sections have values in the thousands, and the game basically has you do like 5 explorations of the same area no matter what because the scenes need to progress.
Edit: It's a Thursday, and I made this review on Sunday, about the same time I beat the game. I still can't stop thinking about this game, probably because of how well the NTR worked,
Honestly, I just wish there were more scenes and more variation between scenes. It's a great game, and there's more scenes than other games, but at the same time, it kind of does recycle the same couple poses over and over.
Also, I wish there were more reasons to actually get to the NTR Ending. Like, I max out my gun and backpack by the time they reach the point of condom sex and then I just kind of chill for the next few weeks. You can't avoid having to go out, because you need to wait for the scenes to finish to get to the ending.