I'd say if you've tried to get into them and can't and then ask why other people like them so you can get into them, isn't the best way to get into a band. If you're not into them, then you're not into them. Plain and simple.
That said, I wasn't into them at first either, it took months for me to "catch on" but I've been borderline obsessed with them since April of 2012 and have seen them live six times since (including this Columbus show where this was filmed).
Their sound is unique and doesn't fit into any genre. Tyler is a good writer, a good singer and a decent enough rapper where they just throw everything together and it all works, for me at least.
I do agree with you on the face masks. I find it gimmicky and extremely unnecessary.
I only say I want to get into them because I feel Im missing out lol. EVERYONE loves these guys.