Who cares? Touch screens are fine for Angry Birds, not so much for anything even remotely complex control wise. Max Payne for example is just horrific on a touch screen, and GTA has many frustrating moments control wise as well. As soon as you start adding on peripherals or hooking your tablets up with a controller you might as well buy a dedicated handheld console or a home console.
The vita is built on a bog standard mobile phone CPU and GPU, imagine if MS released a console with this hardware in it?
Although, NVidia ALWAYS big up their mobile platforms, which are always turds. e.g. the Tegra platform.