If you really want to see/hear how good John Mayer is, try the blu-ray recording of "Queen of California" on the 2013 Crossroads concert. This is not only my go to "lets show off the HT system" demo disc, the music will also send tingles down your spine. It really is that good and IMHO establishes John Mayer as one of, if not the best, electric guitar players in there world.
John Mayer - Opened My Ears
I've heard John Mayer on the radio over the past years. I like his pop songs but was not overlay impressed to be honest. I recently watched via You Tube - Live in Los Angeles, Live on Letterman. Holy cow!!!! I heard numerous songs not played on my local pop stations and remakes of the songs I do know that really captured my attention. His live performances far exceed his radio played material. The 2008 Live in Los Angeles concert was broken up in three sets - acoustic, blues like trio, and the full band. He's also appeared on Clapton's Crossroads concert. His guitar skills really blew me away. He's certainly one of the premier talents of his generation. I would suggest given more years and material he'll solidify his place to the likes of Simon, Dylan...... That's a bold statement but he certainly has the talent to reach that mark. I hope to see him live someday!!!!