Haven't read the thread, but this seemed like as good a place as any to post my impressions of the conference. I am watching the replay now since I was at work.  (EDIT:  How did I not see the stickied thread)

Opening: Kind of lame.

Mario Kart 3DS:
Hang gliders and underwater racing? Holy shit. Awesome.
Available this holiday? There is your killer app.

Starfox 3DS:
Not too exciting since this is a remake, but tilt control seems pretty cool. I know I am not the only person that did this with the controller as a kid. Seeing you opponents faces during multiplayer? Very cool. September release.

Not a lot of showmanship in this conference. Just straight to the point. Kind of boring.

Super Mario 3DS:
Trailer wasn't very exciting, but it never is for me for Mario platformers. I'm sure it will still be one of the best games on the console, and of the generation. Another Nintendo title before the holidays? Wow.

Kid Icarus:
I was not impressed last year. Looks more like something I wold be interested in this year. Multiplayer? 3 v 3? Very interesting. I was not expecting that. Looks pretty cool too. What the hell was with the cards?

Luigi's Mansion 2 (3DS):
I like the first a lot. I can see 3D working well for this one.

3rd parties:
RE: Mercenaries, M&S@Olympics, Ace Combat, Tetris, Cave Story, RE: Revelations, Driver, Pac-Man, Tekken, MGS Snake Eater. Nice, I guess. I don't really care for any of these.

3DS Features:
E-shop, internet, demos(I know some people have been begging for this), Virtual Console (nice), Pokedex3D

Wii U:
Sounds similar to Wii 2 when said aloud. I wasn't sure about the rumors, but I am actually really liking what I see about the new controller. I LOVE that you can play on the controller with someone else watching the TV. That is HUGE as far as I am concerned. The Wii Sports Baseball demo showed some cool potential. Aiming with it too? I like anything similar to the Wii's IR pointer. Video calls? Cool, although I doubt I will get to use it much. I am loving the other gaming possibilities too.

Iwata comes on:
Backwards compatible with all Wii stuff? Thank God. All standard controller buttons, plus most stuff in the Wii Remote Plus, plus microphone, plus camera, plus touch screen. Awesome. Not portable. I expected that. More internet connectivity. Not a big deal for me, but I know other people like this.

Miyamoto:
I can't wait for his games on this thing.

Smash Bros on both the console and handheld? Sweet.

Tech demo: Looks great, but I want games.

Controller "not games or demos":
NSMB Mii: Play only on the small screen is a possibility. As I said before, I LOVE this idea.
Pirate game: Move the screen in all directions to see different perspectives. Could be interesting.
Chase Mii: I love this concept. This was done on the Gamecube with Pac-Man and a Gameboy Advance. This was incredibly fun multiplayer. Now this console can do it out of the box? YES.

Lego "GTA": Wow, lol. Not for me, but good for kids.
Here comes the 3rd party praise. I hope they stick around this time. They have given some good games to Nintendo, but on the whole over the past 3 generations they have been a big disappointment. They really need to step up their game.
Darksiders II: I know nothing about the first. (video looked cool though)
Tekken: The only fighter I like anymore is Smash Bros.
Batman: Arkham City: Here come the cheers! I wanted to play the first, but never got the chance. Now it will be on a console that I will actually own.
Assassin's Creed: Another franchise that I have heard great things but have never had the chance to play.
Tom Clancy's Ghost Recon: Nice
Dirt: Not a racer fan except for MKart
Aliens: Interesting
Metro Last Light: I'm guessing this is in the Metro 2033 (I think that is what it was called) franchise? I heard good things about that game.
Ninja Gaidan: Damn, that trailer was vicious.

EA: The first thing he talks about is a "break through in relationship" and graphics. Lol.

No price yet. Hmm... (not that I expected one)

No Wii stuff? What about those RPGs?

Overall, I am excited. I like what I saw.  To answer your question, no Nintendo did not blow it.

Legitimate question and possible contradiction on their part:

On the video they show how if someone wants to watch TV, all you do is move the game to the controller screen (personally, why not play on the controller screen to begin with? Especially with the type of game he was playing?). BUT..... What if you are playing  game that actually uses the screen as an enhanced control scheme, say an RTS game. Won't that enhanced control scheme be lost if I transfer the game from TV to controller screen?

Looks pretty accurate.

To all the people talking about the Wii U graphics. First off, Nintendo hasn't confirmed anything beyond the tech demos and that it will output at 1080p. However, in all honesty it will be the animations that make the difference not the textures and such. I think Uncharted's fluidity is what sets it apart from all the top end 360 games and not any purely graphical reason. Am I alone on this?

Wii U's probable extra power will serve it well for things like animations, physics, and enemy AI. The controller opens it up to more genres than the standard controller layout can handle properly. And they even let you use all those Wiimotes you thought might be useless come next year. I'm not gonna hate, but appreciate for now.

Did they blow it?

Nae.

My expectations were so low after all the other conferences that I was only mildly disappointed. If MS and Sony had wonderful conferences, then yes Id say they blew it.

Got so damn excited for E3 and now Im just sad.

farthest thing from it IMO. the WiiU has so much potential. now we just wait for nintendo to sprinkle more details around. i am greatly interested in this new console.

yeah cause lord knows how expensive the Wii is, its a real ball buster on price. Not buying it, if a core gamer doesnt have a WIi by now, they didnt or dont want it, which means that they could care less about Ninty titles, not everyone loves Ninty titles. So i ask again, what incentive would a person who already has an HD for them to get Wii U??  Unless they are graphic whores and want the newest in "cutting edge" tech. Its good that Wii U will have 3rd party support, at the very least Ninty zealots could see what they have been missing for years, but this is more to the benefit of them and not so much HD owners

i like how everyone is saying the Controller is uncomfortable without trying it or reading other peoples impressions that have had hands on.

Onthe other hand people have seemed to miss this little article about the PSP VITA:

http://au.gear.ign.com/articles/117/1174087p1.html

those who bothered to read it that guy found it annoying to hold. But at the same time he said he will learn.

LIke many new control schemes, they are wierd at first but you get use to them

On another note dont forget Wii remote and classic pro are compatible with Wii U. So developers have MANY choices.

That's a good sign then, suppose it's like anything new, will take a little time to get used to it.

Potential? I must've missed that one. Is it a brand new Wii game?

This^