Who ever claimed that it didn't? There's lots of discussions on whether the various iPhone killers have actually improved on the iPhone, but I've never seen or heard of one person saying that the iPhone hasn't revolutionized the phone biz.
It's just a phone. People are shocked when I tell them the phone is only ok because I get crappy reception and it breaks every 6 months. It may be the jesus phone but that doesn't mean it's perfect or everyone likes it.