Kings of Leon

Kings of Leon are the rock band of the moment. I have no idea why. Seriously, people who vaguely know anything about rock music, and people that love rock music and all of its subgenres all seem to be on board with the phenomenon that is the Kings of Leon. I still don't get it. I've listened to their records - even more than once. I had to revisit them because I wanted to know what it was that I missed. What is the universal appeal? Why are they able to headline these huge venues now? To me they kinda sound like a shitty Black Crowes (who I also never liked). The only thing that I can think of is that people really love incredibly bland rock music made by white dudes that are related.