I don't think all artists should be shamed for bad remakes, or at least so much. Lots of times it seems that there were pressures on them to do songs that made them seem, well, misguided, e.g.,
- Tony Bennett: Tony sings the great hits of today!
- Ella Fitzgerald sings Beatles stuff, e.g., "Hard Day's Night"
And in a different category altogether:
Eleanor Rigby by Vanilla Fudge