I hadn't thought of comparing him to David before. His pride and rashness do make him lose, but in later books...
I'd never felt it was overused, though that is just me.
Well, yes, but I feel like it shows how Darrow is kind of going 'off-track', as the Sons of Ares would've wanted him to work for the Jackal and gain his favour instead of doing what he did. At times, he prioritised the game over the revolution, and I feel like that is part of his character.
I feel like a lot of the reasons you don't like Red Rising is because it's Pierce Brown's first published book, and comparing Red Rising to Mistborn is like comparing Elantris to Mistborn. A lot of this, in my opinion, gets better in the later books.