I think his point is there is added value to the Vita as a handheld over the WiiU's gamepad. The gamepad damn sure better work well as that is one of its main functions besides being the actual controller for the WiiU.
The vita on the other hand is a dedicated handheld first then a remote play client. Granted, it's a bummer that the remote play functionality is still gimped by some issues (which could very likely be fixed with some software/firmware updates as the technology matures) but it does work and adds value to an already kick ass handheld product.
Plus the Vita can actually do remote play from anywhere.