Nick for Windows 8 is a streaming video application that lets you watch clips from your favorite shows.
If you have a child who likes watching shows on Nickelodeon, then Nick for Windows 8 is a good app to download for them to watch short clips and view pictures of their favorite Nick characters. Beyond that, Nick for Windows 8 doesn't do much.
There is a 'Games' section in Nick for Windows 8 but all it does is aggregate a bunch of links to Flash games on Nickelodeon's website. Clicking on a game will pop you out of the app and into a browser, which is a pretty jarring experience.
There are plenty of video clips but they are very short, usually less than a minute. There are no full episodes of Nickelodeon cartoons, making Nick for Windows 8 a very limited experience. Parents will still have to rely on streaming video apps and services like Netflix to get full episodes.
In the end, Nick for Windows 8 doesn't really do much. The app is more of a hub to take you into a browser to do what you actually want. While it may entice kids initially, the lack of content and features will have them bored quickly.