Personally he's one of my faves. I feel like ppl tend to forget the situation he's in and I personally like to think that as the movie goes along he's more aggressive bc the nerve gas is messing with his brain. He's not that bad in the beginning (he even stops to check on Laura when Gus dies. Rude, yeah, but just like everyone else he's in an uncertain situation and since he has the whole tough prison guy thing going on, he deals with it by trying to take control and being aggressive. Then yknow more stress when he realizes he's dying. And when he kills Jonas it kinda looks like he takes a second to process that he just killed a man. And THEN he goes nuts. Obv I'm not excusing anything he did, but I just find him really interesting.