This article sucked. Mayer is an exceptional guitarist who has been incredible with Dead and Company. While it’s true that some of his more well known hits can be overly sentimental, his albums are really good. His lyrics are deeply personal and his guitar playing on those albums is extremely expressive.
Can he be an egomaniac? Yes. Have album sales gone down? Yes. But as others have mentioned, album sales have gone down for everyone. Additionally, album sales are hardly the mark of a great album. Give me White Light/White Heat over Taylor Swift’s music any day. If Mayer’s style is moving away from pop, then maybe he’s not such a sellout.
His future should be to continue making Dead style music and making a name for himself as a great touring artist a la Grateful Dead, Dave Matthews, Phish, etc.