Jack White was clearly the best performance. Between the smoldering Love Interruption and the outright on fire Freedom at 21, I'm surprised the Staples Center didn't burn to the ground. Frank Ocean was the biggest disappointment of the night. He has boatloads of talent, but he was obviously terrified and he picked his worst song for some reason. The Bob Marley and Levon Helm tributes were very well done.
As for the big winner, it's incredible that even in a year where I enjoy all five albums nominated, it's my least favorite that wins. But Mumford and Sons have the combination of backwards looking and non-threatening that Grammy voters enjoy, so I guess it was inevitable. The Black Keys are too loud, fun. is too pop, Jack White is too weird, and Frank Ocean is too black.
Also, the Grammy's are still so stuffy that somehow even in 2013 a final performance by LL Cool J, Chuck D, and Tom Morello felt kind of subversive.