I have Darksiders II, Call of Duty: Black Ops II, and New Super Mario Bros. U. Darksiders is pretty good if you like action-adventure games, which is obvious 'cause we're on a Zelda forum here; it's not an incredible game but it's fun to play for a while if you like adventure, combat, and dungeons. BO2 is a great shooter, so if you like shooters, get it, and if you don't, don't. NSMBU is really nothing different than any other Mario platformer can offer you; it's actually pretty disappointing, but if you like platformers, go for it. I'd go for Darksiders, though it isn't anything spectacular, and BO2 if you like shooters.
As for what I've heard but haven't played: Batman: Arkham City Armored Edition is good, but worse than its Xbox 360 and PS3 counterparts because the Wii U is less powerful; ZombiU is terribly rushed with all the Wii U's features shoved together in a so-so survival horror game; Nintendo Land is a waste of time unless you have friends to play with it, and I haven't met a single person outside of this forum with any interest in the Wii U so good luck with that; Assassin's Creed III is just as good, if not a little worse than it is for the other consoles like Arkham City mentioned above. I wouldn't bother with any of these games, especially if you can get or already have Arkham City and ACIII for 360 or PS3.