I'm just going to say, personally, that Dwarf Fortress was not hard to learn for me. I am not an avid roguelike player. I don't spend time playing games that have difficult UI. I really have no excuse for picking it up so easily.
The way I look at it, DF is not really that complex. The community here makes DF out as this sheer dropoff of a learning curve, but is it really that difficult for most people? I watched one (1) 30-minute tutorial online and I was good to go. Sure, it will take a very long time for someone to become normalized with the many, many systems DF offers the players, but the core gameplay is quite basic. You feed, clothe, and protect your civilians whilst trying to keep the happy. To do so, you click combinations of buttons (which are mostly shown on the GUI right in front of you) to build or designate things. Different options can be set, and... well, yea, that is pretty much it.
Some more complex things exist; I.E military setup and different construction tricks, but to be perfectly honest the rest of the game is a matter of learning the few keyboard controls that are not shown to you. Once I memorized what ">, <, k, v, t, +, and -" were, the rest was a matter of looking at the lists of keybinding on the GUI and pressing the one I want.
Sure DF is counterintuitive at times, but a sheer cliff of a learning curve? I think not.
All in all, do you agree with the notion that DF is hard to pick up?