You can decide for yourself. Its nearly a kaleidoscope of colors. I think they need to tone them down a bit to make it a little easier on the eyes.
On top of that once you get into the store it seems difficult to find a way out of it. At least in the version I was using. Escape didn't work, windows key didn't work, clicking everywhere didn't work. I had to resort to alt-tab to find my way back to the desktop. (More the the usability concerns creeping int.)
Windows store doesn't seem to have much in it yet. Maybe less than 200 apps seem visible.
Again this is all using Windows 8 on a desktop (in a test VM I'm using).
There doesn't appear to be any way to browse easily the applications at all. To actually download anything you are required to login to a windows account (similar to ipad's, android's etc).
The store like most metro apps operates in full screen mode. Good for tablets perhaps, but not much to look at on a 24 inch screen.
Hopefully with the release in october they will get a lot more content, and perhaps a better UI update.