He's a punk (talks trash incessantly to both his teammates and enemies), initiates personal attacks nonstop, and intentionally teamhits with some frequency.
That said, on siege at least, he focuses on the objectives and tries to lead the team by suggesting effective strategies. Then rages like a child in chat when people ignore his suggestions.
I dunno, I kind of like having him around though, because he's like a more skilled/geared Farmer_Nate. Every time you kill him, it's sure to lead to a hilarious tirade in chat.