I only read through part of the thread, but I'm surprised at how many people consider the Nexus 7 powerful. I got one for christmas and am pretty diappointed in its performance. Even non-demanding games seem to have "hitching" or framerate problems that make me wonder how this can be considered powerful or a better gaming machine than the Vita. Browsing is pretty clunky too when scrolling around. I know they're completely different hardware-wise, but my SGS3 runs circles around it in day-to-day use.
Tegra 3 is at least a few years old by now isn't it? That's why the nexus 7 seems so slow. Also, what do you want for $200? lol
Don't get me wrong in my previous posts, I think that mobile gaming is going to be the future, I just don't think this device from Nvidia is going to flop.
The form factor sucks, and that's the reason it will fail. I understand that gaming is better with a controller than a touchscreen, but have the two permanently connected is not the solution.
All of these solutions provide you with the same thing, and open gaming platform that is portable. With Project Shield you are saddled with one that isn't portable. Any of these other's you can just remove your phone from the contraption, or leave the controller at home and still have a tablet phone available for use that slides into your pocket. So, why not just buy a phone and have something you will get far more use out of?
There will be tegra4 phones available that play games just as well as project shield, and will probably have better displays. I can also all but assure you that there will be a nexus 7/10 or something similar refresh that comes out with more GPU power as well. Also, it seems like a few other companies are announcing "cloud gaming" solutions at CES, google included.
http://www.engadget.com/2013/01/07/google-tv-ubitus/
I think Nvidia really wasted their time with Project Shield and should have just focused on getting their great mobile chips into as many products as possible.