He was boring. He actually needed some problems in his life as he had none.
He also has signs of incipient schizophrenia.
He was a narcissist, not very intelligent and lacked a desire to learn. While it is possible to write a good story where the protagonist is all of these things this was not that story.
Boring is obviously subjective. He’s regarded as one of the most engaging characters in American Lit. Not unlike Huckleberry Finn (who’s problems were much more serious). The fact that he didn’t have any ‘real’ problems is part of the theme. It’s why he struggles. An early case of Affluenza.