I'm sorry, but he's right. They're by far the most over-rated band ever. EVER.
Most over-played song? It has, and always will be Stairway To Heaven. Sure it has a good melody, but it's not much of a song. It'd been beaten to death when the 1990's came around, and now it's just getting downright stupid.
The term "flogging a dead horse" couldn't possibly be used in a better context.