I think it would have to be the St. Louis Rams. They were 1-15 last season and only scored 11 points per game while giving up 27. They drafted Sam Bradford with the #1 overall pick in the NFL draft, which does improve the talent-level of the team. However, there is still just too wide of a gap between them and the rest of the league in terms of talent. They play hard, but they just do not have the talent level to win more than 3 games in my opinion. I think you are also right in bring up the Buffalo Bills. I think they will challenge for that mark as well. They have talent at a few positions, but they do not have anything at quarterback and they play in a difficult division, which means they have 6 games this year against the Patriots, Dolphins, and Jets. I would not expect them to win in any of those games. Therefore, I would leave it between the Rams and Bills in terms of the worst team this season.