The support for Wii U is light years ahead of Wii. Not even close. Getting just 1 AAA multiplat would put it way ahead. Going forward seeing Watch_dogs, Batman:AO, AC4 and Splintercell getting same-day versions is huge. Resident Evil is also a big deal. EA is the only significant 3rd party that has been overtly negative about the platform really. Assuming CODMW4 is on Wii U, and Destiny also comes, third party support for Wii U will be the best since SNES. Nintendo really needs to get Take Two and Konami on board, and ensure continued support from Capcom and SquareEnix, but even without that the Wii U is way more supported than Wii. Indie games seem good too.
There is definitely some concern going forward beyond the current year or two once PS4 and Nextbox are in full swing, but right now the support is great.