Wait are we saying that like all of AC's characters were even relatively interesting?
Maybe Kenway gets slack but he fits within the greedy pirate trope pretty well.
In fact I wouldn't reference anything along the lines of AC or military shooters as quality innovation and creativity.
IMO Ezio was pretty interesting, if only because they had multiple games to build a character. Connor was just boring, plain and simple. His being native american really didn't impact the game or story very much at all. He was native american because they felt obligated to, not because it benefited the story.
I recently replayed the game, and I'm surprised by this reaction by most people.
Connor is very childish and optimistic, and you can see his native roots come out from time to time as he struggles to understand a lot of what the English/Americans are doing. The whole point of his character is to try and reconstruct the Assassin's purpose after the Templars (especially Haytham and Pitcairn) absolutely destroy it with their various speeches throughout the game.
My experience of the game was pretty stuff. He goes from historical figure to historical figure where they tell him to do the thing and he says yes and does the thing. It never got more complex and none of the player's actions ever felt like they had any consequence. The Assassin narrative really never came up in the story at all, besides the the black guy at the start was one of them. Connor's motivations are never explained very well, he rarely speaks, and when he does it's never anything important. I didn't like him very much at all.