It's so weird to me when people say the WiiU has no games. It also rocks 1080p harder than other consoles, in many cases.
In any case, some great games that are already out:
Super Mario 3D World
Mario Kart 8
Smash Bros WiiU
Splatoon
Bayonetta 2 (which also comes with Bayonetta 1 if you buy the physical copy)
Rayman Legends
Hyrule Warriors
Super Mario Maker
Donkey Kong Country Tropical Freeze
Wind Waker HD
Hyrule Warriors alone is a game that can take at least 100 hours if you want to 100% it, and that's not counting its incredibly reasonable DLC.
Plus, games like Star Fox Zero, Legend of Zelda WiiU, Yoshi's Woolly World, and Xenoblade Chronicles X are coming out.
This is just a small fraction of games available for it, too, there's a lot more. That aside, I think it's better to buy fewer games at first, with good replay value, and then expand. Nintendo's really good about making their games polished and fun, something the other game-crazy developers could learn from (looking at you, Assassin's Creed Unity, SIMs, and Arkam Knight).