Moving on, we may clear up the definition of power fantasy, considering the game is very clearly one at least in my book. Introducing MC as a slight loser, underdog, issues with getting girls, money, qualifications, family stability, but very rapidly on his way to become successful in all these aspects and getting endless opportunities, without being particular above average in anything? How is his personality and presence noticeable better than Derrick or the third guy that lost the fraternity qualifications? At first he is scoffed of and belittled by everyone, but at the same time gets a second digit body count in a span of months, can't really fail, most conflicts are merely seemingly ones and end up being a springboard to greater highs.
This is the part I take a lot of issue with, and it leads me to believe you don't really understand the character at all.
He doesn't really have any issue getting girls. He's had a long term fuckbuddy in Zoey, and while working a summer job made friends with an eventually hooked up with an attractive co-worker. He's socially outgoing, funny, and attractive.
He's obviously intelligent, as he gets accepted at B&R his first time applying. He's confident and self-assured, with a father who cares deeply for him.
Obviously the rest depends on how you play him, but he's got a bunch of positive traits where he only needed a chance to shine, and the DIKs gave him that opportunity. First to prove that he could be a solid brother, and then show his full strength by effortlessly falling into a leadership role when there was a vacuum.
Believe it or not, that happens
all the time in real life. Someone with unknown talent steps in to fill a vacant leadership position in a time of need and discovers wells of capability within themselves that they didn't even know they had.
At the end of the of the day our boy is a confident, good looking natural leader with both the charisma and intelligence to back it up.
Derrick is a great partner, but he completely lacks the drive to step up and lead like the MC has. He'll make an excellent VP, but he'd be a terrible president.
Even with the guy who lost the cumpetition, we're later shown he's not stable, simping over and eventually becoming obsessed with and stalking a girl who gave him a 5 second lapdance and made him eat his own cum.