Pretty much everything is better than the disgusting Xbox 360 cases. Probably the worst looking game cases ever produced. That green border looks outright disgusting, and that's coming from a day one 360 owner.
While I'm quite indifferent about the yellow line, I'm actually quite fond of the design.
It's distinguished from the Wii, has ample space for the cover art, and should stand out on shelves.
Now personally I would've liked them to use white, but I guess that would really confuse people with the Wii. After 3DS Nintendo can't afford to have more brand confusion going on.
That's why I actually think that killing off the Wii so early is actually a good idea. The 3DS came out at a time when the DS actually still mattered. With the WiiU, they basically can replace the Wii completely on the market.