You're not describing bugs though, are you? In any event, what about panic PDs makes it op? if the player has enough resources and build power to spam up PD, then that is his advantage. And in the face of an offensive that doesn't have enough staying power to deal with the build power spamming up the PD, then that attack deserves to fail, wouldn't you agree? This notion of "I made it into your base, therefore you need to hurt" is just silly.