NAY NAY and thrice NAY.
I can live with a bit cosmetic tat or "cheats" in literal sense(cheat codes, unlocks) and cheat items that just make the game easier(like the items with DE:HR or Red Dead Redemption). None of them interest me. They are for people with no sense or more money than they know what to do with. Which are bigger problems than DLC. It's exploitative but if the market is there they would be silly not to.
But actual game content? There's little worse and it really puts me off paying for a game at launch(sometimes ever). It's inexcusable and special ediitions and collector's editions should be giving things like soundtracks, art, toys, tat, not game content. At the end of the day it's our brothers in the community we have to blame for the DLC mess we are in now. They are offering it, it sells, they make money, they repeat it. The glorious and discerning PC ubermensch is promoting the practice.