I'd almost agree with cheezy321, because those anti-drug commercials are annoyingly counter-productive.
But my vote is going to have to go with G4TechTV, soon to be G4 again. Thier self promotional
ads look like they were made by a junior high journalism class, after too much cough-syrup.
These guys make the Ditech ads look like intelligent programming.
For one of their highest rated game review shows (X-Play), they have a spot where a
stereotypical fanboy rants about how much he hates the male host of the show
(and how he obsesses over the female host.)
They use the exact same (annoying) station break between each show, and announce the show
in advance during that 10-second break, as if the viewers are too stupid to recognize the same
shows that get repreated twice a day on average.
But what makes it the WORST advertising campaign is the whole process they used to get where
they are now. They basically bought the TechTV network because it had contracts with
cable providers to show in more households than G4 had originally. They then proceed to
trash the lineups of both networks in order to pander to some lowest common denominator of
gamers (Even real (semi-pro) gamers I know won't watch the network), in order to build the
franchise of an "all gaming network". This might have been an acceptable idea if they had
advertised it as such from the start, but instead they led the "loyal" viewers of the network
along until they could re-negotiate the cable contracts so they didn't get dumped from all their new markerts for changing the format of the original channel. In the meantime they make multiple changes
(even to their own good shows) that ends up alienating viewers from both sides of the merger.