Don't know if its just my TV or what, but there is a little black border around the game screen. It's not filled all in like on the Wii.

mines full screen what have you got your display setting on and what tv do you have ?

Some games ARE widescreen while others are not. Depends on your game.

The Wii was designed for SDTVs and used that black border to avoid losing any image to overscan. It's completely normal. If it seems worse on Wii U it's probably because you have overscan disabled (are you using just scan/1:1/screen fit?) and can see more of the border, but that's how it's supposed to be.

Only a few games for Wii are Widescreen, most of them belong to Nintendo. What game are you playing?

Metroid Prime Trilogy

It's not "non widescreen" games it's a lack of overscan. I have the same problem and also had it on my Wii with the TV I'm currently using. Doesn't happen with Wii U content though. There's probably some setting that will work well for it but it doesn't bother me too much so I've just left it as is.

If it's annoying you that much find the proper settings or simply rage about the fact that your TV doesn't handle it properly.

I have this problem too. In fact, when I set up the Wii U I noticed that any Wii U stuff was cut off around the edges so I changed the display on my TV from 16:9 to Fit Screen and it worked fine. Except when you enter Wii mode you get the same problem as above where there is a black border around the edge. If I change the display back to 16:9 it works fine but then I have to change it back when playing Wii U games so it's just another annoyance I have to deal with in Wii mode.

again, it's not a "problem" with wii mode, it's just how the wii itself displayed games. the only reason the black border wasn't as obvious on the original wii is because most hdtvs can't disable overscan with a 480p signal, so some of the black border was cut off. that's what it was there for, to keep the edges of the actual image of the game from being cut off.

it's perfectly normal to see the border and you'll get better image quality by keeping the TV in 1:1 mode, even if it means you see more of the border. otherwise, the set blows the image up enough to fill the entire screen and blurs it up a bit.