An Overly Hidden Genius

Rating: 5/10 (27 December 2019)

There is clearly a mix of glowing and scathing reviews here, so I might as well put my two cents in. So what do I think of it? The concept did not really ring true.
The protagonist is an undiscovered genius who is able to figure out things that stump even the geniuses, such as a complicated mathematical problem, even though he works as a college janitor. He has a poor background and emotional problems from a bad childhood, plus a girl interested in him, yet instead of breaking out of his miserable existence he initially wants to stay in it...but is convinced to change his mind.
So what went wrong? A genius might have a rough existence, but he acts like everybody else around him except for his magically solving complicated mathematical problems. Um, anyone who's so much smarter than his peers would show signs of it that nobody could ignore, such as being able to say and do things most others wouldn't think of. Why couldn't he have become, say, a professional gambler (degree not required)? Why would he cause trouble and not be able to charm his way out of it. Will Hunting is a genius and does not behave like a genius in real life would, no matter his background. That spoils the movie for me.