Probably covered, but why not? I've just bought a Wii U

[tolu619]

This is a bit hard since in your OP, you cancelled out the 2 games I consider to be the pinnacle of local multiplayer gaming. But you really should get Mario Galaxy 2 (even if you don't like Mario games, you'll probably like this one. It's the best they've done) and Metroid Prime Trilogy. They're $20. That's $40 for about a 100 hours of gaming. You already said you liked Zelda so buy Skyward Sword (Wii, I don't think its on the eShop) and Windwaker. And if you have someone to play co-op with, then get Hyrule Warriors and Trine 2 (and/or Trine Enchanted Edition).
Most other games I could call are available, and arguably better, on other platforms. There are quite a few good indie games though. Stealth Inc 2 uses Miiverse well and I heard Affordable Space Adventures makes the best use of the Gamepad so far but I haven't played it. Then there's Devil's Third and Xenoblade Chronicles X coming out this year. I'm answering based on the taste you described in your OP.