I have Crafted. It's a clever concept but in my opinion I think it's pretty bad. Hopefully Notch brings an official Minecraft to the AppStore.
That's a really loose definition of a rip-off. The textures are very nearly the same to the point where the character's shirt is the same color, and the fonts and UI are exactly the same, as are apparently the textures for TNT and bookcases.Though Crafted is still not ripping off minecraft since the textures are of the creator's own work.