And no, I'm saying that because I liked the conference. I was bored to tears to be honest lol. When I mean unrealistic expecations, I mean when people see games at the press conference, they expect it to release either at launch, or only 2 or 3 monthes away. Lets look at the 3DS shall we? The 2010 conference was amazing, it showed the 3DS off great, Kid Icurus, residecent Evil, Metal Gear solid, Zelda Ocarina of Time 3d, Animal Crossing, Mario Kart, Paper Mario, ect... It was great! people were giving nintendo praise! it was a wonderful time...for about 5 monthes. When Janauary hit, and nintendo showed off the real launch lineup, People were confused and angry(similiar to recent e3 reaction). they were saying "How could nintendo show off all these great titles and not bring a single one of them to launch!" They called nintedo liars, insulted its launch like no tommorow, all the negative feedback like "nintendo's got no games lol", ect... Instead of having hate at the E3 conference, they got hate at launch.. MUCH worse.
And when they showed the games at E3 2011 again, people wernt as impressed. They saw a lot of them already so the games didn't give that "WOW" effect anymore. So it gave them a "well, its pretty showing for the 3DS, not great though".
What nintendo's plan is that they don't want to showcase their first party titles. They know it would get the fanboys and gaming press freaking out like mad, they know it would get a positive reaction. But they are thinking ahead, because those same people praising them for their great showing, are gonna insult them when they show a launch lineup that does not include those games. And when they finally do showcase those amazing first party titles at e3 2013, they will go crazy and give nintendo positive feedback once again. Just imagine the reaction if nintendo shows A Metroid, a 3d Mario, the retro title, Super Smash Brothers, and a Mario Kart at E3 2013 with all those titles having a 2013 holiday release date and early 2014 release date. It'll be a E3 for the ages
just my take on it