As great of opinions as I hear on this board, I feel like one underrated experience was AWOLNATION 2012.
AWOLNATION came into Coachella 2012 as one of the most highly anticipated acts. Sail was at the top of the charts, and it was enjoying significant airplay on KROQ, among other A-list stations. I posted up at the stage just after the gates opened to ensure a prime spot for this once in a lifetime experience. I tried to enjoy other bands in the meantime, but the anticipation for AWOLNATIONs performance was too great and prohibited me from providing my attention to these other deserving acts.
Blame it on the ADD....
When AWOLNATION took the stage it was an experience like no other. I would consider it a "moment" for those in attendance in the sense that Daft Punk 2006 was for our Coachella forefathers.
AWOLNATION did not disappoint, and has earned a throne in the great halls of Coachella history.