Pros:
Good baskets
Good signage
Some variety in holes
Cons:
Multi-Use Area: if you go ob you likely have to retrieve your disc from a tennis court or football field. They are accessible, despite the big fences, but it's annoying when those facitilities are in use. Also have to wait for dog walkers and other users of the park.
Some baskets are used for multiple holes.
Some holes are basically just a long put (like a 150 feet shot with no obstacles).
Other Thoughts:
I'm extremely happy that Cologne finally has a disc golf course. It will be a huge step in locally growing the sport.
That being said, it's really just a pitch an put course. Only 9 holes, only 7 baskets, some holes ridiculously short/easy. However, there is also a tunnel shot and some corners you have to take with lots of OB around, so it definitely is a great course to get into disc golf and to introduce others to the sport.
I wish for this course to be used a lot so that the city recognized the need to allow for a bigger course to be built.
If I'd live in the area I'd probably be there every day, but for me it's a one hour drive and I feel that's not really worth it. Even if you live in Cologne it's a bit out of the way.