This rating system is used at test of all kinds of products and is highly respected by experts like Wolf-Dieter and Werner, not only because it is invented and tested by the famous critic (Kunstkritiker) "Kali" Sizmo. It is supported by Wolf-Dieter and Werner. Because Sizmo likes cows, he uses COWs for rating.

 
 

COW		Is worth one COW. It is possible to have up to five of them.
Dead COW		It's worth half a living COW. Usually there is one dead COW, when the product doesn't get a full rating. There can be up to five of them, if the product rated is violating COW rights.
Holy COW		Usually appears in teams of five. It means the product is outstanding.