Pros:
Dunegant Park is a pretty decent 18-hole course in a multi-use park. The course design loops back to the parking lot at 9 and 18, giving a distinct front and back nine. The front nine holes are a mix of technical park-style shots while the back nine is all open throws with some landscaping/tall grass OB's to mix things up. Both the front and back nine have a rolling landscape so there are elevation changes that are put to good use. The course overall is an Intermediate-level challenge, although windy days can make the back nine an adventure. The red tees are concrete with tee signs; the blue tees are natural and marked with pavers in the ground.
What is notable about the Dunegant Park design is that it is one of the very few courses in St. Louis (and possible the only Gateway-designed course anywhere) where the flow is logical and you can easily find your way around the course without a guide or map. There actually are next tee directional arrows in the ground next to the baskets as well.
The baskets are Gateway Titans and are cemented directly into the ground, so each hole has two tees but one pin placement.
The back nine has very little in the way of trees, so the grass is left high with mowed fairways. Tall grass hazard is a pet peeve of mine, but here the fairways are decently wide and give you something to realistically aim for. There are places where some of the tall grass is defined as OB to try to add some challenge to open shots and the pin on hole 11 sits up on a hump to give a bit of an elevated basket. They at least tried to make the back nine more interesting than baskets in an open field, even though baskets in an open field is really what you have.
Cons:
The one hole I really take issue with is #17. It uses tall grass OB to the left (there is a ball field there) and tall grass hazard on the right, giving you a defined fairway to hit. The hole is long (over 600') and mostly downhill, but the tee is not at the top of that slope. It's on the other side of the apex of the hill, so you tee blind throwing uphill at a fairway that drops dramatically downhill with tall grass on each side. You basically have to have a spotter or really be confident in your ability to hit the fairway, or you are going to be tromping in tall grass looking for a disc you didn't see land. Given how long the hole is, the red tee should be at the apex so that the shot isn't blind. You can leave the blue tee down the hill, but the red tee should at least give players a chance to find their disc.
Hole #1 has a marshy overgrown section in the middle of the fairway with no real route through. You either have to clear it or pitch over to the right to set up an approach shot. It gets a lot of complaints since the marshy area eats a lot of drives, but there is a safe play on the hole. It's not a great hole, but I'll give it a pass.
Pohlman Road is pretty busy and there are two pin placements set close to the road that you throw at. It seems like those could have been set farther from the road. Hole 9 throws pretty much at a parking lot. Otherwise, the design is safe and has very few conflicts with other park uses. There is a potential for problems on hole 17 with the ball field to the left, but the design address this with O.B. tall grass between the ball fields and fairway.
The course has blue tees which mostly just make the same shot longer. On hole 9 the blue tee is actually an easier shot to hit and on hole 5 the blue tee is shorter than the red tee. On hole 16 the blue tee is on a slope about 50' behind the red tee, but they missed an opportunity for a huge shot by pushing the blue all the way down to the bottom of the hill where it flattens out. That shot would be at least 100' behind the red tee shooting up a steep hill; they could have mowed out a big landing area for blue tee shots and make a real monster of a hole there. They didn't, though.
The design does what it can with the back nine, but it's still a tall grass hazard design. On windy days it's pretty impossible for someone at my skill level to hit the fairways, so I end up tromping around in tall grass looking for my disc, getting extra bug bites and basically have a miserable time. It is what it is and I hesitate to call it a "con" since they are trying to do something with the little they have to work with, but it's not really all that fun.
Other Thoughts:
The back nine has been redesigned at least three times. Every time I visit, it seems to have been altered. Originally there were shots in the woods to the east of where hole #16 is, but there was a dispute over land ownership and all the holes had to be moved out into the open. There also used to be "sand trap" areas filled with gravel that played as OB, but those have been removed. In a few places they have planted some thick, tall vegetation that can be used as an OB replacement.
It should be noted that map on this site is incorrect for the back nine; holes 13-16 have been redesigned. They are easy to follow, though. Some of the pictures on this site are of the original design and show wooded holes on the back nine and the old "sand trap" gravel OB areas.
In my rating I have Dunegant dumped in with some second-tier St. Louis courses like Willmore, Fort Zumwalt and Briscoe Woods. Shot-for-shot it probably does not match those courses, but those courses get dinged in the rating for poor flow, no directional signs and/or poor tee signs. Dunegant has good flow and good signs (other than hole 2 where the tee sign is missing.) If the shots are what is most important to you, Dunegant should slide down toward the bottom of the second-tier courses.
Dunegant Park is a nice Intermediate-level course that sits between Sioux Passage and Endicott Park, so people traveling and looking for a round probably would not choose it as a place for a round. As far as local courses go, it would rate pretty far down the list. That's a good plug for the area, because the course isn't bad at all. It's a relatively new course so it doesn't have a loyal following like White Birch. It is pretty overlooked. It makes for a decent round, though. It's nothing super special, but it's a decent course.