What I tried to do is use results from the Group Stage and now the Hex to rate teams in the same way I do for MLS games and see what comes out. I think it's actually done a pretty good job of establishing how each team has been performing and maybe some inkling on how teams are trending.
Here are the raw numbers as they stand today.
Now I know you may be thinking that, with Mexico's struggles, they should perhaps be lower. The thing to remember is this is looking at five game form and goes back to the First six games played prior to the Hex, where Mexico tore it up. You can probably see their recent poor form better if I graphed up ratings for the first five rating points.