Pros:
Marr Park is the only course in the area and is an quick one to play, with easy navigation. New concrete tee pads were installed recently, clearing up some confusion with teeing areas. Signage is okay, but it shows distance to the basket which is good enough for me.
There are a lot of styles of holes here that won't be found many other places, which makes this a good course to practice wooded upshots, threading through trees. There are tall, mature trees on every hole that take out nearly all "over the top" lines. The tunnel shots on holes 3 and 4 are very challenging, and there are several options on 5, no matter your skill level or how your first shot lands.
The creek that comes into play on several holes offers a nice challenge, punishes errant shots, but doesn't give too much of a risk of losing a disc since it's pretty shallow. The barbed wire fence on holes 4 and 5 is not in good shape, so it's easy to retrieve discs from the other side.
Cons:
The baskets are terrible. Spit-outs, while annoying, will be common on this course. Signage is also terrible - the maps are useless. At least it's easy to tell where the next hole is.
Many of the lines through the trees are... unusual, that wouldn't be found on good courses. The gaps on hole 4 are tiny, and hole 9 has pretty much no clear gap through a wall of trees. The lines also favor RHFH shots, at least for me, because the thickest woods are usually on the right side of the fairway, so playing this course many times has dampened by backhand skills.
The barbed wire fence on holes 4 and 5 can be climbed but makes searching for discs unnecessarily long.
This is a multi-use park. There is a picnic shelter on holes 3 and 4 that is a real obstacle, and makes those holes unplayable if there's people inside. There's also a lousy basketball court and playground, a locked bathroom, and a walking trail that comes into play on most holes. It's not uncommon to see people hanging around on a fairway or exploring the creek.
Other Thoughts:
This is a short course, so it takes two rounds to get any real amount of fun in.
At the end of the day, no one is doing much real work around here for the disc golf course particularly, which makes things like alternate pins impossible to manage. I'm glad there's cement tees now, but this course doesn't provide enough good holes to warrant anything higher than a 2 for me.