I must admit that I was totally wrong about the badges. They really seem to motivate to contribute to the Wiki. I speak out of my experience, so I would like to apologize for my first harsh reaction.
Also, I didn't left unnoticed that after the redesign, some of the elements (for instance, the edit pages altogether) do not fit the general design any more. In the next days, I will make the necessary tweaks in the .css to keep the Wiki design clean.