Shot for shot this is a pro-caliber challenge. It's a tough, tough layout. There is the lake to contend with on several shots, the wooded holes have thick underbrush to punish you and the more open holes are long. If you like a lot of challenge, this course has it.

The lake in Unger Park floods. Regularly. When it floods there is no stream or any way for the water to escape, so it sits until it evaporates. The course makes aggressive use of the lake with several holes utilizing water hazards, and these holes are flooded often and for long periods of time.
The area of the course is not very well maintained. The underbrush grows up and the course has a very overgrown feel to it. When the water is down and the course is playable, the combination of the holes near the lake and the thick underbrush makes this course a lost disc nightmare.
The tees have not been finished, and tee signs and directional signs are not up. The course basically has not been finished even though it has been open for over a year.

I don't like to knock a course for being too tough. If this course was used for tournaments, I'd say it would be a nice piece to the St. Louis disc golf puzzle as it would provide a great challenge to Open PDGA players. However, the course cannot be used for events due to the frequent flooding. You can't depend on it being playable on any given weekend. So it is a Pro challenging design that will never be used to challenge Pros. That to me makes little sense. As it is the course is unplayable for such long periods of time that it really does not seem to be serving any purpose.
So really, I don't know how to rate this course. The design is tough, so for that I'd rate it very highly. However the design is not taking into account the reality of the situation the lake flooding creates, so for that it has to be rated poorly. In the end I just gave it a 2.5 because it is in the middle. That seemed like a better option than flipping a coin.