Pros:
Big Walnut Sports Park is basically a sampler pack of disc golf holes.
The course opens with a ~12 foot wide 190 foot tunnel shot before letting you really stretch your arm out.
Walking paths play as OB along the distance holes to keep you honest. The wooded holes require some tight lines.
The layout is very well balanced in regards to both forehand and backhand shots. You can't just spike hyzer your way to victory here (unless you can throw like Simon or Eagle).
Plenty of parking and different options for starting holes. You could park by the maintenance shed near hole 5's basket or the softball fields near hole 12's tee if you prefer. There are some portalets and restrooms scattered around as well. Soccer fields near the maintenance shed are rarely in use and provide a good area to warm up.
Cons:
While there is a variety of holes they're all kind of grouped together so it's sort of like playing two courses in one. 2-7 play back and forth along the perimeter of an open field. 13-19 play through the woods.
The pars on holes 3, 5, 6, and 12 are pretty forgiving. I've played a sanctioned event here and they were reduced by 1 each, so take that for what it's worth.
There's no practice basket, but you could probably get by using hole 17's.
It's not uncommon to catch a faint scent of manure from the nearby farms. Doesn't really bother me but if you didn't grow up in the country it may be an offensive odor to you. I've also heard a loud MOO more than once and if poorly timed I suppose that could ruin a putt or drive for you.
The more wooded holes are pretty overgrown and could use a little TLC
Other Thoughts:
Big Walnut Sports Complex also boasts some softball fields, a basketball court, the afore-mentioned soccer fields and a decent enough playground if you're looking to fit some other activities in besides disc golf.
There is private property across the road near hole 4 that could come in to play if you shank a drive bad enough. Also the woods along holes 8, 9, 11 and 12's fairways could cause a poor drive to disappear. There is a small creek that comes into play on a few of the wooded holes but there's not much risk of losing a disc in it.
All in all, I think this is a fun course that will keep you on your toes and requires at least a couple different shot shapes. If you find yourself driving along I-70 or US-40 and have an extra hour to spare you could do a lot worse than sneaking a round in here.