Man, this must be a joke. The games we have seen look way better than the tablet games you refer to. If this is a reasonable argument, then we can pack up the whole non-mobile gaming industry: "It's a stationary box with expensive games and an online fee."
It's not about games looking better. If it was about better looking games the Wii would have sold about 30 units. It's about the perception of value. The games may look "better" (completely objective) but in what way does it appeal to:
a. People who already have a current gen console or are considering buying one
b. People who play a few games on their phone on the way to work or school
Leave the "Nintendo fans" out of it, because that's a very small portion of the potential user base. Does the Switch have mass appeal? Nintendo are asking people to buy in to a device that costs more than the competition with the main selling point it's a powerful handheld (or a really weak home console). So was the Vita, so what?