I just finished season 1. It was good. I saw the brother thing from a mile away though. Im going to finish the rest of the series. From the posts on here it sounds like doakes leaves later in the series? Or dies. I wouldn't be surprised if dexter ended up killing him, he is all up on his nuts at the end of season one. It would totally be against dexters code, but ultimately his goal is survival so maybe. Don't spoil it, I will watch on and see for myself.
It also seems like he is not going to be able to keep his secret from rita and deb forever.