What exactly is this lie?
Just watch all the interviews. Todd lied about a lot of things, especially the capabilities of their Radiant system (just like with Oblivion). On the back of the box your disc comes in, in reads, "The legendary freedom of choice, storytelling, and adventure of The Elder Scrolls in realized like never before."
There is no freedom of choice. The storytelling is heavily scripted and linear. What adventure? You're give an omniscient compass that tells you exactly where to go. It's all [censored]. Yay, we have awesome graphics (.. for a TES game..) and dragons, but all of those other things were already done in previous TES games, and were actually better. We have limited factions, and we're railroaded into joining most of them (there are ways to circumvent that, but you aren't made aware of that until after it's too late). We have limited quests where our choices actually make a difference, and even less that provide more than one path to completion.
The MQ and civil war quests are no different. You can't do one without affecting another, and unless you're actively involved in both, that might not be a good thing. You haven't even joined a side, yet you're negotiating terms between them? You want nothing to do with dragons after Helgen, but you can't complete your civil war mission without the fact that you're Dragonborn being shoved down your throat? Yeah, I can see Bethesda made Skyrim accommodating to those who wish to roleplay. Bravo, Todd Howard. Bravo.