So how good is Wii U Gamepad as a controller, compared to current ones?

[SvennoJ]

Sorry to rain on the parade, but on mine the left analog stick is sometimes slow to engage. It's making certain sections in Zelda HD almost unplayable. Instead of going full throttle he occasionally only shuffles slowly forward when pushing the stick all out.

Other then that it's comfortable enough, although I find that I start playing on the map screen on the gamepad instead of paying attention to the tv for certain games.