Shoot, If I had a company which made product X, and my competitors spent millions on a media campaign to say it does something bad 100% of the time, when in fact it didn't, I'd be suing their Aszes, if for no other reason than to pull the ads off the air.
Suing people is not always the answer. (Never involve the government in a private matter unless you absolutely have to...)
It would breed bad will and give more ammo to those who already drink haterade all day. Suing usually just generates more headlines, ignoring it is the best course of action IMHO.
Let them hate all they want. It's not going to stop me from writing software that people use and enjoy.