Big Brother was one of the games that brought me to F95. Loved BB and this game brings back those memories. It's very similar to BB in the playstyle, so yes, it can be a bit grindy but that's just the way these types of games are. Not to mention the family dynamic being similar as well. However, there's definitely plenty of differences to set it apart as it's own game and not just another copy cat.
That being said, the models and renders are all great. The animations are all great. There's more than enough content to keep you occupied for hours upon hours. The main story and side stories are engaging enough to keep an interest. The progression with the various women, while not always logical, is slow but progressive enough to make them acceptable.
There are a few cons of course. First, the system can be a bit confusing. Particularly the "personal status" page on the phone menu. It's not really easily understood. A help page, some hover tips, or something would be helpful without having to seek outside resources to better understand certain aspects. Second, EVERY woman in this game has big to massive tits. Yes, I'm a lover of big breasts, but variation is the spice of life. So some cute women with small perky tits would've been nice to see as well! Adds a bit more realism to the games.
That said, cons aside, it's a great game and I'd definitely recommend if you don't mind the slightly more grindy games. So I think it's definitely underrated a bit and thus, for me, I'll happily give it 5 stars.