I didn't know there was so much Shuriken hate. As for those of you calling it a "rip off" of the disc, I have to disagree. Shurikens have been used by the Japanese as a concealed weapon since like .. forever.
I thought the Predator's shuriken was awesome especially the little flip/flick thing he did with his wrist.
The disc vs. shuriken debate is pretty much a matter of preference. They both accomplished the same task (cutting/slicing through something). It just seems like the shuriken was more practical because it is lighter, smaller, and collapses.