Here's the thing, many movies have an imperfect protagonist by design.

George Nada is imperfect, but fundamentally decent.

He didn't ask for any of the stuff that happened to him. He is just a dude who wanted to work and make a little bit of money.

Once he finds out how fucked up things are, he wants to do the right thing even though he's in over his head.

That's what make the movie interesting.