I think Michelle got it right when she said that
Mystery Men was disappointing even though she hadn't had any particular expectations of it. Both the premise (ragtag group of superhero wannabes with wimpy at best superpowers are forced to step up with the city's leading superhero goes missing) and the cast (Janeane Garofalo, Geoffrey Rush, Tom Waits, William H Macy and others) raise expectations that it could be a genuinely sharp, edgy, funny satire, but instead it's simply a good-natured and somewhat overlong action-comedy, pleasant enought but ultimately forgettable - a pity.