Being a fan since the beginning, it has to be Bat1 for me.
Like someone else said "that album was Rock & Roll history" and it was/still is for that matter.
Since we haven't really heard Bat3 yet(well most of us haven't anyway) I'm not sure where it will end up fitting in the order of what I consider Meat's greatest albums, which for me so far are in order of...
Bat1
CHSIB (wish it had better promo, as I think it could have gone far)
Bat2
WTTN
J. xo