DLC has been around for years, they're called "Exapansion Packs". Or atleast thats how I think of them.
Although I do agree with Total Biscuit on this one. It really does sound as if this was originally part of the game, and it was cut out to get more money out of the franchise.
TB brought up the issue of DLC in the last TGS podcast. And Jesse Cox did say "Mass Effect is like the Star Wars of the gaming industry. Since the series is now coming to an end, they're trying to make as much as possible before it does." And to be honest I have to agree with him too. All these little extras they've brought out, putting up DLC content on XBL before the game is even released, I'm sorry but it feels like Star Wars all over again. Heres hoping they don't decide to do some rubbish spin offs or try to remake all the games.
I don't disagree with DLC. Like I said in my first comment they've been around for ages. Just they used to be on CD's. Its just the ones, like Mass Effect 3s, that just feel like it should have been there originally, and they've just clipped it to drag a few more £'s out of it. And thats what I disagree with.