I try to be as honest as possible when shifting through smut.
For this, the gameplay is simple, bit of a spin on the RPGM-type of deal. Instead of moving around sprites and bashing E/spacebar on everything, instead it pans out more like a visual novel, where you choose where you want to go to within your house and what actions you want to take with your niece (then later her mom).
Now in that, lies the meat of the game, moving throughout your house, and generally doing actions to corrupt your niece. However, there lies the fault of the game. If you don't mind games that have a grind like the many others that populate the genre, then it's old news for you, but for anyone turned off by that, then unfortunately it's the driving point of the game.
Think repeatable actions that number in the dozens in getting to where you want to get to. The more you repeat certain actions and take certain paths, the more corruption you get, but be ready to keep on the keep on to get to the "bars" of the ladder when climbing the rungs for each progression. The progression itself is nice and serves its purpose for the corruption aspect, as your niece does become sluttier and sluttier, but as for the grind, you'll really have to stomach it if you want to ride the debauchery.
To have some check on the corruption, you have to level your actions by not just perving out from the get go considering that too much heat generated from doing actions will get you kicked out of the house. So for that, you can't just keep grinding against the wall without nothing stopping you, thus, you have to maintain a balance (and a healthy amount of saves) as you go onwards by not being a total creep all the time, while being a creep at the right times where you won't totally be punted out of the house by an angry father.
Which is another rather loosely balanced mechanic, as when the corruption ramps up, there are parts where you'll do an action that'll tank your "trust" lets say on being able to stay in the house, where you can be sitting around 60, and getting an H-event on either doin' it on the couch or banging her at the mall will send that over 100, thus getting you kicked out of the house. Now, I haven't played this in awhile, and that could've been balanced out, but I remember using the mod attached back in the day to circumvent a lot of the things in the way of enjoying the smut material of the game, rather than punishing myself for hours. I did a good first playthrough of it, rather than going the mod/save edit route, but this is a game that you don't play through twice, more so just a game you hold the saves for for that quick crank.
For the visuals, it's good enough. The context and situation are enough for me, just a sandbox where you can corrupt willy nilly if you do it right, so if that's enough for you then the honey models wouldn't be too much if you're already numb enough to the amount of games that utilize them.
All n' all, instead of a 3, it's more like a 3 and a half. It's good enough to shoulder the smut it has, but the gameplay mechanics sometimes get in the way of a good thing.