Instruct: Classify an Amazon review as either positive or negative.
Query: Is mine defective?

I was excited to be able to play with this new toy with my 4yo son. I got brand new energizer batteries, popped them in and....it won't walk on the carpet and barely walks on the tile floor. It most of the time won't respond to the commands that are given and when left to roam he sits and screams or growls at us. The only part that is really fun is to set it on protect...that it likes. It snaps and growls at the older boys scaring them.