Despite good reviews, very bad

I used the sharpener after use!
At first I thought: "Wow is all very sharp"! But the leaf-cutting test has not passed it and look at closer, I discovered that a lot of grooves in the cutting are !! : O (
I thought the knife was to blame and tried it in another (WMF).
Behold, here.
The knives come a just reason fumbled in front because the edge is destroyed!
But that's not the point of a knife sharpener!
I wanted to zero stars distributed, but that is not so!