Pros:
Very beautiful, large park with a lovely fine-gravel main promenade around a catch-release pond, open fields, equestrian facilities, playgrounds, picnic areas, etc.. With spur trails into woods, the disc golf course, etc.
Manageable holes once you figure out where you are and which hole is what number. More later on that.
Varied holes overall, though some in the middle and back start to repeat the type of the previous or near-previous hole.
I believe the front 9 (barring short no. 6, old bricks) now has paved teepads. I believe there are other paved tee pads at nos. 11, 12, and 15. These are long enough and wide enough for those of us with long legs and arms.
The course opens with no. 1's fairway sharply descending through fairly-narrow woods to a small creek. A tester out of the box.
Has a nice balance of wooded and open holes on the front 9. No. 11 starts rather open before a guard line of trees before the open green. Then it is back into the woods, pretty much.
I think no. 10 might be the most challenging hole. It is a tunnel that descends to a creek. Narrow footbridges over said. Over or around a mound as you rise from the creek. Basket tucked in a grove of trees to the right.
No. 5 (presently marked as no. 19!) is the big open bomber hole. I believe it is over 500 feet and one of the 3 par-4s.
Nos. 8 and 9 are quite pretty, sharing a small meadow ringed with trees.
No. 12 is one narrow tunnel ahead of an even tighter section of trees. The basket is dead ahead, and the hole is quite short. But there are plenty trees to hit!
Beautiful bench at new no. 6 and a handsome one at no. 4. Both generous in size. However, I didn't see any others.
Cons:
The primary problem is signage, as noted by others here. Everything is fine until you finish no. 3. There is no next-tee sign to direct you from 3 to 4, so you need the course map to figure how to walk over the two park loops to get there (through small woods). The no. 4 basket btw is elevated on a tree stump and just at the right bordering tree line.
The bigger signage trouble starts with big 5. It is labeled as no. 19. Then you look at the course map on your phone or what you printed out from DGCR. You walk around in the gardens (warning, bee hives!!) on the other side of the creek tree line. You look at the pictures here too and scratch your head. Apparently holes 5, 6, and 7 (the old ones) slotted between this creek tree line. What you have now is a reoriented old no. 6 teepad that plays to the old no. 7 basket. It takes more than a minute to figure this out. This is new no. 5.
That means most everything going forward is now 2 nos. less than the current online course map says. Old no. 8 is now new no. 6 (it has a long pad also), old no. 9 is new no. 7, etc. I think most hole signs of new holes 6-18 have something on them indicating this now (taped-on pieces of paper). There is a new (from scratch) no. 16 between old 17/new 15 and old 18/new 17. The tee for new 17 is now on the border of the soccer field. The tee of new 18 is deeper in the woods beyond the basket of new 17. The tee of old 19 appears to be the basket placement of new 18. I know. It's confusing, but print out the map and hand-edit your printout, based on this paragraph. You will get clarity on what is what.
One definitely needs next tee signs from 3 to 4 and from 9 to 10. For the latter, you walk down the paved path towards the green barn, then go left on the intersecting path to the edge of the property. There you will find two stakes in the ground to mark the short tee of 10. Not sure where the long tee would go... These stakes have orange, numbered labels on them. You will also find them at nos. 13, 14, and 17. Nos. 16, 17, and 18 have green mats.
Seems to have a lot of muddy places, even on dry, cool days. It's shady along a good deal of the course with less-than-good drainage.
Walkers and runners are determined to walk through the fairways. I had them on nos. 6, 13, 14, and 15. Despite having *two* pedestrian loop trails and a kabillion other trails in the park. It's exasperating but unfortunately common in multisport parks. I try not to lose my temper and only say something to those who actually encamp on fairways. No encampers thankfully on my first outing here.
Other Thoughts:
It is a pay-to-play course from March-October (I believe). You need a credit card for a dashboard ticket if there is no booth attendant. If you play other state park courses on the same day (Brandywine, White Clay Creek, others?), you can use the same ticket and feel like you are getting more of your money's worth.
When the state parks authority and/or local disc golf club have the money for signage and can complete all the teepads, this course will shine like the star it actually is. If there is a GoFund me for this (I don't know), I would certainly contribute. For now, call it a diamond in the rough.
UPDATE (2/20/22): Signage now totally updated and clear. Concrete or asphalt teepads at every hole now. I believe also longer baskets have been added to nos. 1 and 4. And shorter baskets added at nos. 5, 7, 10, and 18. So now, I believe 6 holes have 2 baskets, and 4 holes have 2 pads (previously existing). Makes for good extra variety. The course is just too busy. At least on a holiday weekend. And some of the regulars are disruptive and rude. Mix of abilities and sizes of groups can lead to traffic jams. I think though if you can play early working weekdays, maybe you have a shot at a peaceful round. Locals can confirm that better than me.