My favorites were Bruce, Chris Martin, and McCartney. All three were great, IMHO. I was a little suprised I enjoyed Martin as much as I did.
Understanding that this was an incredibly long concert - and therefore probably not practical - I was very disappointed that various combinations of people didn't play at the end. I would have shortened each invididual bands sets, so this could have happened. I love the collaborations, including the seeing the joy on performers faces while they are playing with others.