The main problem is the leading actor. "CSI" has William Petersen as Gil Grissom, a great actor and a great character, and "Post Mortem" has... Hannes Jaenicke. Don't get me wrong, i normally like him, his first movie ("Abwärts", 1984, with Götz George) is one of the best German thriller. Recently, he made some B-Movies, and since i am a die hard fan of these genre, i watched them ("Submerged" was good, "Venomous" OK, "Stranded" a mess). But giving Jaenicke the role of Dr. Daniel Koch was a huge mistake. Would you watch a series with Dolph Lundgren as psychologist? Or with Michael Dudikoff as a profiler? You probably would not, and nor does it work in this TV-show.
So, simply forget about it and watch the original, no matter if you prefer Vegas, Miami or NY - everything from Anthony Zuiker is way better!