Some of the Bomber stuff was monotonous, but I wholeheartedly disagree for Ace and Overkill, even if there is filler. I mean for christ sake, those albums invented thrash metal! (with a little help from Venom and Priest of course, but still)
I don't mind them dropping Ace Of Spades or Overkill (but not both) so long as they replace either song with the song Motorhead.
I listened to three Babymetal tracks...sounds like Chun Li getting butt-fucked by Andrew W.K. That's not something I ever wanted to hear.