And The Rock sold out arenas for years before he was given the title right? Not knocking Rocky, but he had only been a top guy for a few months before being given the WWE title at Survivor Series 1998, hell At Summer Slam 1998 he was in the middle of a (albeit awesome) IC title feud, not exactly headlining PPVs, that was what Austin and Taker were for. Being in the right place and the right time and just connecting with the fans is something you cannot knock, it's just having the gift of gab... Which The Miz sure as hell has.
He was the hottest guy in the company opposite Austin when they were fighting for the IC title. Miz and Del Rio are the "best" of a crop of new guys who all, quite frankly, can't draw flies. Just because they're new, doesn't make them good.