As I said, I'm a bit old for that humour.
When I was first getting into metal as a young teen then yeah, I thought Ten Masked Men and COB covering Britney Spears was funny, but now it's just not funny anymore. I'm not into Ultravomit or any of those joke grind bands. I like humour in metal, I love Gwar afterall. But just being a death metal band and covering 80s pop songs doesn't do it for me, and outside of their humour there's not much left in the music to sustain it's power.
This is just my opinion anyway, if you dig them then more power to you. The obviously have lots of fans so they must be doing something right.