The worst cover versions are the pointless ones, ie songs which cannot be improved on. Baker Street comes to mind.
Damon.
Agreed. Also pointless are the ones where nothing is changed from the original in terms of tempo, instrumentation etc, but they manage to remove all the soul and charm.
Most of the 'Best' covers do something innovative - reading the other thread probably confirms this.
A sub-category of 'Pointless' would be where an artist rips off someone ELSE's interpretation of a classic. (I guess this is how X-factor is produced.)
(I'm sure SOMETHING good could be done with Baker St, if the human race lives long enough. they would probably need to ditch the saxophone. And the guitar solo which is really the best bit - simple but perfect.)