What a nice use of government resources!

I'd wager that if you filed a lawsuit against someone for negative feedback you'd either a) get laughed at b) win, and get awarded nothing. "Judgement for plaintiff in the amount of $.01, and 1 positive feedback!"

Seriously, what would you expect to win? If you own a restaurant and a customer doesn't like you food, and tells everyone how horrible you are, and you take him to court, in order to win anything you'd have to prove actual damage to your restaurant -- monetary damage, not "People don't like me!" People are allowed to have an opinion, and the ebay feedback system is how they can express their opinion on that site. The only way you would have a leg to stand on is if their feedback were explicitly libelous; i.e. you'd have to prove that what they say is false, and damaging.