One of the things I love about MLS is the parity. Sure there are better teams, but overall there isn't really the dominance like in the premier league. Basically you could pencil in Chelsea, Man U, Arsenal, Liverpool, City (recently) and Tottenham into the top 6 slots. Of course you have surprises like last year Everton and this year Southampton, but it doesn't change the general point.
Right now, you have 5 teams in the east who coudl in theory be in first. Red Bulls are in the best overall shape, but the Fire could also with th eright results be right there. Out West everyone is pretty good. Worst ranked Rapids are at 7 points, which considering games played isn't terrible. It's not good mind you, but it's not terrible.
What will be intersting is to see how Montreal comes back from Champions League. They have only 4 MLS matches, and no good results from them. They should be a solid squad, but I think they're resting their guys for the CL and with MLS, depth is pretty terrible. I won't watch it during the Gold Cup, Toronto without Jozy and Bradley will be GIovinco and who knows.
Being blunt, liekly MLS players to make the cut include the aforementioned Jozy and Bradley, with Rimando, Gonzalez, Shea, Besler, Mix, Zardes, and other potentials like Hamid or Johnson (US may use Yarbrough to cap tie though), Jones, Goodson, Wondo, Zusi, Evans, Agudelo, Nguyen, and Beckerman, Lots of potential for turnover that could shake up MLS. And that's jsut US players, not factoring in other countries as well who're well represented in MLS like Honduras, Costa Rica, etc.