It seems the best way to come up with an answer here is to find a band that NO ONE would seriously try to defend when you start to describe the ways in which they suck.
For everyone who named Beatles, Zeppelin, Rush, Doors, etc... you could probably get at least a few logical, unbiased counter-arguments as to why they don't suck.
There is only one band that comes to mind right now where you could not engage in a debate about their musical competence. So, please, someone speak up and defend the artistic merit of Limp Bizkit.