I agree completely. I actually wanted this a lot, but I'm not buying the same game again for full price again. The only substantial change is that they added a real battle mode- which was supposed to be there in the first place and only wasn't because they had to rush the game out to save the Wii U. They owe us that; I'm not paying $60 for it. Other than that, it's just a couple of characters and a few tweaked mechanics. And don't forget you're going to have to pay to play online now.
I don't understand the defense force over this; this is why Nintendo does stuff like this. Because their fans will still buy in droves and even defend it. I just don't get how you can be so happy to pay a full $60 again for essentially the same game at 1080p. It would have been totally fair to give an eshop discount to those who own the game already on Wii U, and I think it would have helped make Switch itself a little more appealing to sell the game a little cheaper to everyone and make it that much easier to fill out a good launch library. I'd still love to buy it on sale, but Nintendo doesn't really do those, so...