It painted Max as an asshole from an early part of the game, and his character just went downhill from there.
Max is an arsehole though.
Our avatar in the game, is a selfish pervert who's happy to let complete strangers jerk off to hidden cam footage of his hot female relatives. He also has no compunction about having sex with them too, and clearly doesn't mind it being seen by those strangers too. The only blowback from that, is Eric blackmailing him after the first time having sex with Kira.
Maybe it's just nostalgia, but the characters at the beginning seemed richer and full of promise before they all degraded in one way or another.
It's sort of nostalgia, based on how you thought/hoped the characters would be. Kind of like riding the hype train for a movie or game, and being disappointed by it.
Ann completely sold out her family for Eric, before seeming to slowly lose her sanity as she lounged around the house in a towel all day when she wasn't being talked into making porn or giving her son handjobs because of his supposed carpal tunnel syndrom. Alice started as just a bitchy big sister begging to be tamed or seduced, before eventually turning into a blackmailing dominant bitch. And Lisa started off innocent became increasingly superficial and seemed to care the least for Max out of the entire family. But she honestly seemed to become more and more devoid any emotion the longer the game progressed.
Remember, they're all fucked up and already harbour incestual desires, Alice in particular for Max, with the rest following from whenever they first see his dick. Even Kate, who was a lesbian at first then changed to bi-sexual so Max could fuck her. Hell, she's fine with filming the girl she loves having sex with her own brother.
Kira was the better character of all his family members, simply because she was honest about it. Ultimately though, she's a grown up female Max.
Big Brother is/was a clusterfuck of ideas, and bad development choices.
It had good potential to begin with, but poor handling of Eric and capitulating to the horny desires of incest fetish fans who wanted Max to be sticking his dick in anyone with a vagina, ruined that potential.
Actual gameplay wise, it's bad. In a primitive "least amount of effort" kind of way, but nobody played it for that. Hell, it's barely more than a visual novel as far as being a game is concerned.
It's all about the sexy renders and taboo of incest with those sexy renders, or for others not into the actual incest, the thought of fucking those sexy renders.