Federal Trademark Dilution Act

Should dissatisfied consumers have the right to establish gripe sties that use the trademark of the offending company in the domain name? How likely is it that consumers will be confused as to the "origin, sponsorship, or approval" of the gripe site by the offending company? Whether or not you think that confusion is likely, should a gripe site be considered to tarnish the targeted company's trademark and thereby violate the Federal Trademark Dilution Act? Why or why not?