I don't normally find myself returning to the TTV boards but when I got the emails about this topic I felt inclined to jump in.
Obviously, Skillet is not the greatest band ever, neither will they ever be. We look to the likes of Led Zeppelin, or the Beatles for such a title, however they also will never be the worst. We look to the likes of 1 Direction, Linkin Park, or even Nickleback to fit such a bill.
As for the use of computer modification, that's called artistic development, you can't keep going on unchanging for years and years. I also don't find Comatose to be guilty of such computer modification as you seem to say.
And just for kicks, who, in your opinion, is the best band of all time?