Pros:
Jefferson Barracks is easily the most popular course in St. Louis; it's the local favorite. It's very easy for somebody like me to overrate this course because of that.
This course has a good combination of elements that make up good disc golf courses. The course design is solid and challenging. The park has the usual St. Louis "rolling hills" terrain, and this course uses it to provide some tough uphill shots and some fun elevated tee shots. There are also some cool pin placements with roll away danger you have to manage. There are a few wooded shots, but for the most part it's a park-style layout. There are some cool design elements like hole three which plays like an island green on an extreme slope There are four pin placements per hole and the baskets are rotated regularly. Set up in the all-long placements, it's still a pro-level course.
The course is very well maintained both by the parks department and the local club. The tees are concrete and the tee signs are good with indicators of which basket the placement is in. There are restrooms and a water fountain by the pavilions and a few benches scattered around the course. It's a very good example of a 1990's course boom design, and it holds up very well today.
Cons:
When this course was installed and I had played five other disc golf courses, it was stunning. It was easily the best course I had played and stayed among the best I had played for a long time. The cons are hard for me to bring up, but they are there.
It's by and large a park-style course. There isn't just one gap you have to hit on most of the shots, there are a variety of routes the the hole. Other than a few shots, it doesn't really force you to pull out a bag of tricks. I can RHBH hyzer shots here all day and get away with it. I can miss gaps and sneak shots around the trees anyway. You can usually scramble to save par, It's not a cupcake by any means, but it doesn't play as hard as it did back in '94.
I remember getting lost here the first time I tried to play the course, and the flow is still pretty choppy on the front nine. Getting from hole 1 to hole 2, hole 5 to hole 6 and hole 7 to hole 8 could use better signage to help first time players not wander around.
The portion of the course that has holes 1 and 8-18 is a bit small for that number of holes. Holes 8 and 11 run parallel to each other and you can easily get in the other fairway, Hole 10 is set up in a way where you could easily throw into 9's fairway. It's not anywhere close to the worst course I've seen for this, but you do have to keep an eye out for other golfers here.
The course is not in a terrible neighborhood, but there seems to be an issue with crime in the park. I've had my car broken into in the parking lot.
Other Thoughts:
This was a top-notch course when it was installed in the mid 90's. While the design is a bit dated, it has stood the test of time well and is still a very solid course. The area has several very good courses, but this is still the course that best represents disc golf in St. Louis.