I'm honestly asking how old you guys are to understand something. Perhaps it's not such a big deal to be completely fabricated and fake, which is what BabyMetal is. A quirky idea executed by some record exec or manager who found these little girl singers and then studio musicians for the sole purpose of servicing a specific market.
The opposite of what makes the best music of all time, musicians who worked on their craft with friends and fellow musicians they were naturally drawn to within scenes. Who came out of obscurity with an incredible story, with substance and meaning to their art. People with artistic integrity.
Listen to them if you want, have fun. Just realize, BabyMetal is not to be taken seriously.