I was impressed, actually! WSC was disappointing since I'd heard so many good things and they turned out to be sort of frightening, but the Klaxons put on a good show, even though it wasn't really my sort of thing. Quality entertainment. My sister really enjoyed it, she's a fan now. She got a set list so maybe I can post that for you when I get home, if you'd like.
I didn't understand anything they were saying either! But I think they were excited to be in DC because apparently the crowd was especially good here, and because their tour manager (my ex) is from here. He'd been totally hyping it, and one of the only parts of the banter I understood was when they said something about their tour manager Simon being from DC. They went "sightseeing" after the show, I wonder how that went...I hope they weren't disappointed, after how excited they were, HA!