Well, Sterlin is down on his luck when he moves back home, so I guess that's accurate in a way...
whos only purpose is to fight off being NTRed by some creepy old guy
That's a good purpose, I think, if you don't want to be NTRed by some creepy old guy, I mean.
and be dominated by the few female LI's?
Well, first of all, it's not a "few". There's plenty of women to go around. And second of all, he's not being dominated by them, more by circumstances (which also dominate the women, so things don't go their way either).
But in all seriousness, this game is a fantastic parody of plenty of porn games, yet manages to outshine all of them. While there are a lot of NTR fans who like this game, it's actually the ultimate anti-NTR game (which shows how smart those guys actually are (THIS IS A JOKE! Don't take it seriously, guys)). The whole point is to stop your women from being defiled while taking them for yourself. It's a harem game, disguised as an NTR game. The whole "the MC is a loser" thing comes from the fact that, unlike other games where the MC uses all sorts of tactics to get pussy, here it's all reactionary. The MC reacts to the situation, rather than create it. Yes, he's not completely pro-active, but he doesn't need to be. With the women in this household, things would blow up in his face if he tried to force something. Instead, the game moves at the pace of the women, and as the game progresses, so does their pace. So, really, you have nothing to worry about. Give it a shot. If anything, you'll laugh your ass off.