Fair enough. My point was more that DLC having impact on the main story is a good thing, instead of being just a bunch of axed sidemissions finished and released later. Not that even that's necessarily a bad thing, *cough* bring down the sky *cough*
And I disagree. I don't see it as a good thing. Sticking with just the major components should feel like a complete experience.
Mass Effect 1 should lead to Mass Effect 2, which should lead to Mass Effect 3. Having to make miscellany sidetrips into DLC, comic book tie ins, novels, and the web original live action series just so you can understand why major changes happened to the main character between installments is going to leave people who don't follow the extras feeling frustrated. They're more likely to drop it since it stops making sense for what they follow.
I thought the 90s comic book crossover obsession illustrated this rather well. "How did the X-men get to the moon between issues 128 and 129!? What do you mean it was in Cable #13? I hate Cable. F this!"