Example of a musician that was huge but was always respected as a musician:
Bruce Springsteen. He seems to have always been considered not only a huge success but also a great musician. I haven’t run into anyone who has said “That dude sucks”.
Example of band that was huge hit but lost cred in the process:
Metallica. This bands core audience abandoned them when they changed their sounds circa Black album. As each subsequent album came out they were panned by ciritcs and fans alike. They seem to have recovered with the last album though.