Pros:
This course contains a very large variety of hole lengths and levels of woodedness and difficulty, meaning there's something for everyone. The front nine would be great for playing a round with someone new to the sport, and personally, I don't think they're total throwaways, either: there's enough variation in elevation, obstacles, out of bounds, and pin placement to keep you going, even if there's nothing particularly memorable about them. Holes 10-15 play in dense woods, and 16-17 across a broad, sloping fairway before 18's relative openness. I didn't make it to 19-27, unfortunately.
Amenities (water fountain, bathrooms, and parking) are very accessible.
The staff that we met were very nice and eager to help.
Cons:
I feel that there are a lot of drawbacks to this course that impede the overall experience.
First and foremost, navigating the first 9 is indeed horrendous. We had several extended searches to find the next hole, causing the front 9 to take at least twice the necessary time. Perfect course flow isn't always possible, especially in a more open area that lacks obvious directionality; that said, the layout on these holes is a downright head-scratcher that can easily frustrate. The fact that these holes play across the park's central field also has the potential to lead to major conflicts with non disc golfers. There was no visible attempt in the course's layout to avoid such a problem, when there seemed to be space to do so.
There were several kinds of tees on this course, but all had their problems. Most if not all of the front 9 were concrete, but they were exceedingly short and narrow, making them unusable for me (and I don't have a big run-up by any means). Furthermore, their positioning often prevented me from driving in the grass next to them. This hindered my ability to play and enjoy these holes.
The tees for holes 10-15 had a completely different problem. They were natural tees that felt unsafe for a variety of reasons: 10 was at an absurdly steep angle, 11 was from atop a slippery (at the time I was there) rock overlooking a steep drop off, etc. This kept me from getting any legitimate run up on my drives, severely limiting how I was able to play these holes. I understand that it's harder to establish quality tees within a wooded setting, but seemingly no effort was made to do so on these holes. I've seen it done elsewhere in the area (Orange Crush, Moraine, etc etc) enough to know that it's more than feasible. The poor quality of these tees really detracted from my experience here, since I couldn't play these holes to the best of my already-tenuous ability.
In general, the wooded holes felt built around a desire for pizzazz more than quality; they came off as gimmicky and lacking of substance to me. Yes, the playing environment is gorgeous, and potentially interesting, but this portion of the course seemed very raw. There was an absence of lines and general effort to shape these holes or provide them with any form of a path or fairway. Paths/bridges/etc were also missing, which would go a long way to making this section disc golfing friendly. As is, I had some precarious moments trying to navigate the severe elevation and unsure/rocky footing. I'm fit and experienced at hiking through rough conditions, so if my sense was that the environment these holes play in was dicey, I can imagine that they'd be impassable for more than a few disc golfers. I can think of a lot of folks I've played with who I wouldn't take through here. My complaint isn't so much the natural topography as it is the lack of any visible effort to improve the conditions.
Based on the size and proximity of the creek that cuts through 11, I'd guess that it would flood after a decent rain. In such a condition, I imagine 11 would be wholly unplayable, and other holes might be affected, too.
The fact that none of the holes I played (1-18) stood out to me is itself a pretty bad sign.
Other Thoughts:
I feel obliged to further highlight that I did not play the final 9 holes: we ran out of light, unfortunately. I initially hesitated to review the course because of this, but I had strong opinions on the safety, playability, and organization of the course that I wanted to share. The last 9 holes had little chance of impacting these opinions. In general, I would not recommend this course to others if they asked me: it's not terrible by any stretch, and it has some potential, but it also has some real problems IMHO. Coupled with the fact that there are such quality courses nearby that offer better versions of the same basic experience - if you have a hankering for woods then play Two Mile Extension, 11 miles away - I doubt I'll make an effort to try Thompson Park again next time I'm in the area. As always, YMMV, folks.