Does this protector disable the touch screen on the pad, or the touch screen is as usefull as there were no protector?

Nope, the touch screen still works perfectly with both fingers and styluses

Is this anti-glare? I'm looking for something that will keep the glint of light off the game pad from piercing my retinas -_-

I wouldn't consider it anti-glare (matte) by any count - I can still see a rather clear reflection in it. I would consider it an improvement on the original screen, though, reducing ≈10% of the glare.

Is the yellow rectangular piece that came in box to be used to clean screen before applying?

If you are talking about the cloth, then yes that is for cleaning the screen beforehand. There is also a rectangular piece of cardboard that is used for pushing out any small bubbles that do appear.

Wii U Precision Screen Filter

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