The Beatles
Here's the thing. Though The Beatles are undoubtedly "the best band of all time," they also don't sound ... great. Their songwriting is fantastic, and that's not disputable. But the production is so thin and leaves the listener begging for a re-mastered album.
Radiohead
Some people wish Radiohead had just stopped after they released "Creep" and been a successful one-hit-wonder. However, they went on to release music for two decades, and the "best" album they have to show for it, OK Computer is literally just fine.