The main issue with ads is message saturation. Like how my wife decided to buy me (for xmas) Star Wars tix so we could both go see it.

Yes, I thought it was ok, but she had to hire a babysitter and in the end, if I'd been asked prior, I would've said no, or asked for a better movie (like The Martian).

I have the feeling ads almost always sell you something you'd have been better off not buying anyway.