Pros:
1) This courses strongest feature is the elevation around the park. Most holes play over rolling hills, have left/right sloped fairways, or shoot steeply up or down hill. Only and handful of the holes play mostly flat. Hole 13 is definitely the signature hole of the course. It's about 400 feet straight, but at least 50 feet down hill so it's reachable with a putter for moderate to high power players. Throwing a driver on the hole brings fading out into the thick rough left and right very much into play if you don't get the nose down.
2) Despite being a mostly open course, the areas of woods are used quite well. Three tight-ish tunnel shots on holes 4, 10, and 16. The rest of the holes vary from mostly open to completely wide open. As the years go on some of the holes are getting tougher. The trees are growing taller on 1 making it more into a tunnel shot down the main fairway and hole 4 is getting tighter. Though, other holes are thinning out. Hole 7 had a large tree come down in a storm recently and made accessing the green from the right side much easier.
3) Tee pads are typical. Plenty large, and provide good grip. Additionally there are benches and small trash bins on nearly ever tee, which is very nice when the course is backed up. Maintenance is also generally quite good. The grass is always cut, trash isn't usually too bad, etc.
4) Links up with the Meadowview 9 hole loop between holes 11 and 12, making an easy way to make a 27-hole round if you are in the mood.
Cons:
1) The biggest issue here is flooding/drainage issues. Holes 1, 3, 6, 7, 9, and 10 get wet easily and stay wet for much of the year. Hole 1 and 3 have ponding issues that you just have to avoid, while 6, 7, 9, and 10 all have a small drainage ditch across the fairways. There is usually ways to get across and keep your feet dry, but after heavy rains it's almost unavoidable.
2) A couple holes are a bit cramped together and could pose safety issues. Holes 4, 5, 6, 7, 8, 10, 13, 14, and 16 all have risks of errant shots coming at you from adjacent holes. While most of these aren't major issues you definitely need to pay attention when the course is busy.
3) With the exception of the few holes mentioned in 'pros' section there aren't many exciting holes. A couple holes just feel like fillers and don't really serve a purpose except to move you around the course. None of them are bad holes as they all have at least a little bit going on; be it some elevation, or the small creek on 14. If I had to pick one hole for 'worst' it would be 17; mostly wide open unless you shank it real good, very slightly uphill, and the tee pad isn't level.
3) Tee signs exist, but they aren't of much use. The have distance, (course) par, and the worst hole maps ever to glisten a tee sign. They do nothing to give you an idea of the shape of the hole or location of the basket. The distances on some holes are also a bit more inaccurate than usual due to recent pin location changes by the park to mitigate erosion issues.
Other Thoughts:
Overall, Plamann Park offers a pretty average, maybe slightly above average, disc golf experience. I feel a 'true' rating for the course is closer to a 2.75 and part of me wants to knock it down to a 2.5 due to it's aging design, an every increasing amount of trees coming down in storms making the course easier and easier as time goes on, and the serious erosion issues in places. But, I'm bumping it up because it's just a fun time to get a casual round in here when it's not busy. It's a great beginner to intermediate course, but advanced level players will get bored or frustrated pretty quickly with the layout as many of the holes straddle the area between 'pitch-and-putt' and standard disc golf holes. There are a couple pretty good par 3s (4, 7, 13 and 16) that require a well placed shot to get the birdie and one tweener hole (1) that you need pro level power to get to the circle, but the rest border on birdie-or-die (or definitely never bogey holes) for anyone ~900 rated and up. Also, not the courses fault, but it can get very busy. I haven't played during the evening or weekends here in a while, but previously on nice days you could expect to be waiting 10-15 minutes on almost every hole. When it's empty you can pump out a round of 18 in under 45 minutes if you walk fast and stay on the fairway, but when it's busy it could take 2 hours or more.
Similar to my recent re-review of Grignon Park in Kaukauna, if you are in the area and have a little time to kill I'd recommend stopping by for a round. But, if you are from out of town and only have time for one course in the Appleton area I'd recommend you take a pass on Plamann and check out O'Hauser Park in Menasha.
Update: Review rewritten and score lowered from 3.5 to 3.0.