Awesome Shalrie Joseph? Never heard of him.
Also, we have no idea whether any of them are good enough for the English leagues as you have about an extra 30 seconds on the ball in the MLS. In the Championship especially where the favourite tactic is to close down fast and tackle hard, i'd imagine any American footballers coming here would take far too long to adapt.
And most of them have been sh*t anyway. McBride was the best so far, Bocanegra was average, Johnson who was supposed to be "the best American striker ever" has done f*ck all even for Cardiff, and Adu has disappeared off the face of the earth. Dempsey was also hailed as "the American Ronaldo" by his former manager - LOL.
I'd suggest that when it comes to rating these players, it is the Americans who are being typically smug - blaize - and superior, not us.