I picked up a Zelda Wind Waker HD Wii U 32gb bundle on Newegg about a month ago for $286 including shipping. That felt like a pretty good deal considering the Wii U 32gb bundle was $350 just a bit ago. Wind Waker HD is a download though, not the actual game disc, which I found disappointing.
Overall, in the month I've had it, I like the Wii U a lot. The real kicker is the gamepad, the controller with a 6" touchscreen. In my house, it's hard to hog the TV for game time, so the fact that I can play every game on just the gamepad is great. I've been playing Zelda, Assassin's Creed 3, Nintendo Land and Batman Arkham City on it. The gamepad is light and easy to hold, with just OK battery life (around 3 hours). It came with a handy charging stand though, so I have yet to have issue with the battery running out too soon. It's not the highest resolution, but in my play time all games look really good on it. It's also a resistive touch screen, but one of the better ones I have used. It makes you appreciate modern high-res capacitive tablets though. I also like the fact I can plug headphones right into the gamepad. It's like a super powerful handheld, even if you can only play it in your house.
When you play the Wii U with your TV, the gamepad becomes a second screen and most games use it to show your items or map in a constant view. Some games, like Nintendo Land, really push the use of the gamepad by letting one player use the gamepad to do something while the rest play on the TV. That leads to some fun gameplay since the gamepad player is the only one that can see that screen. They also make use of the gamepad camera in fun ways for the other players to see.
The Wii U seems pretty powerful, but its hard to say it's any better graphically than the Xbox 360 or PS3. Maybe when I can play some next-gen games on it (whichever ones actually come to the Wii U) I'll know better. Every game I have played looks fantastic though. I've been very impressed with Zelda Wind Waker HD, the first Zelda in HD (even though the game itself is so much older).
Nintendo's Wii U OS is kind of a mess honestly, as is their account system and its crazy they still don't have a single ID that is shared between all of their systems (although I think the Nintendo ID is trying to get there). I wish it worked like Apple or Google's account system. I should be able to buy a game on my 3DS and play it on any other 3DS I sign into. I shouldn't have to use their stupid system transfer tools. The same applies to moving from the Wii to the Wii U. It's a really painful, clunky system and inexcusable by today's standards. I really hope Nintendo improves in this area.
The Wii U is backwards compatible in that it basically has a Wii built in. You literally flip over to the Wii OS when you want to play Wii games. They all work just like you'd expect (no HD) and all of the Wii controls are compatible with the Wii U, even for some of the Wii U games. That's a really good thing as Wii remotes become such an investment. The latest Wii U firmware update even allows you to run the Wii on the gamepad, which I haven't tried yet. Apparently it works great though, so I'll give that a go soon.
I'm excited to see where this console goes. It's going to be the only system for Zelda, Mario, Metroid, etc and you know Nintendo does it's titles very well. I'm a bit nervous though about game support by 3rd parties in the future. So far it feels like only Ubisoft supports the Wii U. I'm sure it's powerful enough for games for the next year or two, so I hope the Wii U doesn't get left out. I hope the Wii U ends up being like the 3DS, where for the first year it did really bad, but then the game library caught up and the 3DS became a really great portable. Regardless, I have some awesome games for my Wii U with more on the horizon (Mario 3D land, Watch Dogs).
If you want a versatile, yet powerful, yet not as expensive as true next-gen consoles, the Wii U would be a good buy for you, especially if you love Nintendo's titles.