IP is not the only way they can deduce who wrote the survey
why not be safe and give good ratings and not autistically waste your time for no reason?
you are not changing anything by giving bad ratings, you are only potentially harming yourself
everyone wants good results in the survey just give them what they want since it costs nothing to you, number 1 rule in corporate environment is give people what they want and not make enemies
if you honestly believe your work is shit just find a new job