I was rather disappointed in Nintendo at this years E3 because there was so much hype for the new system and the Wii U simply didn't live up to it.  Here's why in my opinion I think the Wii U will fail:  
 
First and foremost, the Wii U is yet another gimmick by Nintendo and another gimmick that will be topped by Microsoft and Sony.  The Nintendo Wii introduced motion controls and that was a unique and new idea and it was fun (for about 3-6 months) then the gimmick of the whole motion control died down and sales flat-lined.  In come Microsoft and Sony who looked at the Nintendo Wii and said, "motion controls, hmmm, that seems neat.  Let's see what we can do."  Then the gaming world was introduced to the XBOX 360 Kinect and the Playstation Move, whose motion controls were/are vastly superior to the Wii's.  Both Microsoft and Sony were able to introduce Nintendo's new gimmick concept into their consoles without having to create a new system that was solely based on the idea of "motion control."  I imagine that execs at Microsoft and Sony were watching Nintendo's presentation at E3, like many of us, and when the Wii U was revealed I'm sure they looked at each other and said, "time to blow Nintendo out of the water with this one now too."  There is no doubt in my mind that both Microsoft and Sony will come out with much better versions of the Wii U, because the Wii U is giving them a lot of areas to be able to improve upon.  Off the top of my head they can incorporate HD, multi-touch screens on the controllers and have up to 4 or 8 players be able to use the controller instead of just one.  Come on Nintendo!  Seriously?!?   
 
Second, in regard to the Wii U's ability to stream the game from the TV to the controller let me say this...WHO CARES?!?!  Assuming that everyone has a relatively nice screen TV, why would you want to go from the TV to a small 6.2 inch, SD screen?  Oh but wait!  No longer will you have to fight over the TV because you can just stream the game to your controller whilst the other person gets to enjoy watching a TV show!  Having been a gamer pretty much since I was able to pick up a controller, never once have I had to fight for the TV.  Honestly, when have any of us had to fight for the TV to play a game?  Especially with NIntendo claiming that with the Wii U they're aiming to please the hardcore gaming community; don't you think that being a "hardcore" gamer one of the prerequisites to that would be that we have our own TV?  Hardcore gamers don't just have their systems hooked up to a TV with a fold out chair, hardcore gamers have pimped out gaming setups.  Big screen TV, surround sound system or headphones and a gaming throne to sit comfortably in, because hey if you're going to game for hours on end, you want to make sure you're sitting in a chair that's pretty damn comfortable!  The average home has three or more TV's and you're telling me this person who needs to watch a TV show can't watch somewhere else?  The only time I can see submitting the TV to the other person would be if it's your significant other, in which case what makes you think that they're going to be fine with you playing games instead of watching "Generic Hospital Show" with them?  But that is a topic for a different discussion.  The bottom line is that being able to stream a game to the remote seems pointless unless of course the range of how far away you can be from the system goes beyond the room that it's in, which the Wii U won't be able to do.  Once again, come on Nintendo!  Seriously?!? 
 
Third, as for the iPad, err, the controller itself; why in the world would Nintendo only allow one per console?  So one person gets to have fun with the new remote while everyone else has to kick it old school with wii remotes and nunchuks?  That just seems like such a HUGE oversight!  Especially since Nintendo (or at least the Wii) grabbed the attentions of a much younger generation.  How are you going to tell a room full of 8 year olds, "Now wait just a second there Timmy, it's Porter's turn to use the cool new controller, you have to use the old ones for now."  Come on Nintendo!  Seriously?!?  
 
Fourth,  I was just slightly interested when all those third party developers showed major interest in the Wii U, but then I came to my senses and thought:  Let's say EA comes out with NHL 13 on the Wii U, 360, and PS3, why the hell would I get it for the Wii U?  I'm aware that the Wii U promises not to use those inane "friend codes," but I bet whatever social online support they muster up won't come close to Live or PSN.   
 
Fifth, so the Wii U will be Nintendo's first jump into the wonderful world of HD and will be equal to or greater than the power of the 360 and the PS3.   That's great!  That's just great Nintendo!  So your new system that's due out in 2012 is rumored to be equal to or better than systems that have been out for 6 years?!?  Being 6 years behind you figure Nintendo would have been more like, "It will definitely be better than the 360 and the PS3!"  Not oh umm...maybe equal?  Not to mention that Microsoft and Sony seem to be due for next-gen consoles so when those do launch, once again Nintendo will be left in the dust.   
 
Now I'm not just some Nintendo hater, in fact Nintendo has been my system of choice ever since I was a kid.  But now I just find myself hoping that they suffer the same fate as Sega because they can't seem to get their act together.  I mean come on how cool would it be to play Smash brothers on 360 where you can party chat with friends, check out leaderboards and actually play the game online!  Here's to hoping that this is the beginning of that for Nintendo.