When I was seeing TV at night, I surprised about one advertisement. One of Cellular provider in my country attacking the other Cellular Provider. This advertiser said on the advertisement that the other Cellular Provider is bad (Indos*t is cheap and bad, X* is bad because of too many agreement for the features). Of course, this is really bad advertisement, not sportive enough. Good company should 'play the game' fairly.
Today, Cellular user is smarter to face many kinds of advertisement. So advertising a bad content just will make 'the boomerang come back deathly'.