Pros:
Ken Caryl is a very nice course in nice park in nice neighborhood. It makes for a good beginner course, or mids and putter course for experience players, or even an ace race (8 of the 9 holes are legit ace runs for most people.)
The course is relatively short, but still has plenty of trees to avoid. Requires shot variety- various lengths, left, right, and straight. The fairways are very green and grassy and there is no chance to lose discs. The concrete tees and baskets are in good shape.
And of course I must mention that anytime you get a chance to play a historic Steady Ed designed course, then do it.
Cons:
This course (like most in the Denver city area) is popular and is often played and can get crowded in a hurry. It is in a small area with tees close to baskets and holes close to one another. Could be issues of throwing in to people or getting thrown in to.
Baskets were fine, but the course had two different styles- some were old while others were new- too bad when some of the baskets were upgraded that all of them weren't.
Other Thoughts:
I had fun playing this Ed course, going for aces and racking up birdies. We played it twice in a short amount of time. There were lots of other people playing, but everyone was friendly and all were having a good time.
If I lived in Denver, and was introducing somebody to disc golf, I would take them here first. If coming in town for a disc golf vacation, this one is skippable, unless just driving by and you want to play an older classic Ed course then it is worth a stop.