...a wise word of advice from Johny Depp in "Inside the Actors Studio" (probably a reflection on his interaction with Disney corporation and "Pirates of the Caribbean", but he didn't explicitly name it).
Well, I've got a similar observation. Years of work for advertising agencies have left a feeling of dissatisfaction, even a waste of time. You can never finish the work and make it as good as you like, if you're deadline pressed. It will never have anything to do with you, your interests, things you want to express, or trends you want to adhere to or be a part of. What will come out of your hands will be just like every other processed fast food - and by the way, as an "artist" in advertising agency you don't have enough time to eat anything better and tastier than fast food in short breaks between the consequent production line demands.
Stay away from that business as long as you can and savour the time you have to contemplate the effects of every next step of your art process.