I will say that Sledgehammer is one of the worst songs ever recorded, from an otherwise good artist... never could understand how it became such a big hit.
I mean it's no "Solsbury Hill", but it certainly isn't as bad as "We Built This City" for being one of the worst songs ever. It became a hit because of MTV and the innovative video, but the song itself isn't terrible. I mean the lyrics and lead vocals aren't groundbreaking, but the layers of sound and mix of beats was pretty inventive.