Ready, Set, Goo! The Goo Goo Dolls's John Rzeznik Lets 'Er Rip On Critics, Humility, Fame--And Bush's Foreign PolicyBy Vanessa Juarez | Newsweek Web ExclusiveAug 29, 2002He's got the scratchy voice, the gorgeous, ultrawhite teeth and the just-woken-up shag. But if you actually get past John Rzeznik's cliched rock-star exterior, you'll find he's also got a few real things to say.THE LEAD SINGER of the Goo Goo Dolls, Rzeznik spent 10 years touring with the band before the trio broke through in 1995 with their signature ballad, "Name." A follow-up in 1998 gave listeners the lovely "Iris" and the