As a management question, the problem with being the president is that one cannot anticipate what important issues will arise in the future. No one thought terrorism would be the paramount foreign policy problem during the 2000 campaign. I guarantee you there are issues that will not be talked about during this election year, but will dominate the presidency in 2009 and beyond.
Perhaps the best experience to be president, then, is the ability to successfully cope with the uncertain and the unknown. Of course, some managerial experts would not call that “experience.” They would call it “judgment.”