I'm not a fan of Isner...but I don't have anything against him either. It just doesn't matter one way or the other what he does in tennis as far as I'm concerned. I have seen some improvements from when he first came up - with him basically being a "server" and nothing else. Now he does have some pretty good ground strokes but he definitely need to work on his movement. However, with him being "tree" tall...I guess movement will suffer. When he's "on", he looks really great. But then he can play like he played on Sunday and then you think "he won't win a major".
But among all the Americans, right now, he should be considered the #1 American (on form). Fish is going down; Roddick is going no where...there isn't much to "celebrate" for American men tennis right now other than Isner.