It was interesting, actually, because Eleanor and Matt were somewhere between hostile and apologetic about the whole RMC thing. On the one hand, they were definitely far less confident in their stage presence and delivery than when they were doing the RMC tour. On the other, prior to introducing the RMC title song, Matt said something along the lines of: "And here's a song that everyone should know, from everyone's favorite album."
I enjoyed RMC, but it's not in my regular rotation. I'm glad they did it though: there isn't any doubt that if they wanted to do White Stripes or Strokes style stuff they could fucking nail it -- the fact that they choose to go their own way is what makes them so awesome. They're one of the few bands I'm aware of with a typical instrumentation (guitar, keyboard, bass, drums) trying to do something interesting with lyrics, narrative, and song structure.