So, balance is needed. ATV is a cool thing, but not fully developed, or rather, not thoroughly thought out. You can try to balance it by experimenting with the values for different creatures. Perhaps it makes sense to give some creatures bonuses to defense when fighting certain types of enemies, or something like that.
PS It's difficult for me to judge, as I haven't played the beta, so my judgments are based solely on the statements of other forum users. If I said something wrong, I apologize, it wasn't intentional.