I liked Cody, I talked to him a few times and he seemed like a nice guy.
However, Matt Graham seems interesting. I like that he doesn't seem to be in any hurry to get rescued, and he also seems genuinely happy. He might be a bit too much of a hippie at times.
I don't like Joe. I understand the need for such a character on the show, since a lot of folks probably identify more with him. I'm an anthropologist, so I find primitive skills fascinating. The way Joe talks and acts is a bit irritating, just a personal opinion.
I know the show is scripted (I run a translation company as a side business and have done work for Discovery's "reality" shows), I watch it for pure entertainment. I don't expect one of the blokes to starve to death or get eaten by an alligator.