Well, I summarised some of my personal highlights after watching it once. It is cheap, illogical and poorly made/dubbed (speaking of the German dubbing), so I would never dare to criticize it, being the total euro-crime fanboy I am.
However, the average poliziotteschi-fan could be easily bored because there is not so much action going on, the review of the book "Der Terror führt Regie" is completely negative for example and calls it one of the movies to avoid.