Pros:
In some ways Acorn is a great beginner to intermediate level park. It's the quintessential "local course" for any suburban-city dweller. Short enough that anyone can play it. Long enough that good players will still be able to let a few drives rip at full power. Wooded enough that it's not just an open field. It presents a pretty good variety of shots without being overly punishing or difficult.
The front 8 are all birdies for anyone who can throw 300 feet and all very aceable. From there it gets a bit harder, but not much. It's below average difficulty when compared to other full length courses in the area. There is some funky water to contend with, but shooting around it from an alternate tee is always an option.
Acorn is a casual friendly course. Its got nice baskets, benches at a lot of the holes, and it flows pretty naturally. There are always enough people there that getting lost shouldn't be a problem.
Cons:
It gets ungodly busy during peak hours in the spring, summer, and fall. The course only takes about an hour to play a leisurely round in a small group, but that can be doubled or tripled by wait times if you go on a weeknight or weekend. Lines of 10-20 people on hole one are not uncommon and large groups (6-10+) of complete noobs with no knowledge of etiquette appear regularly.
The quality of the teepads is inconsistent but they are serviceable.
There is a very legitimate chance of being hit by a disc or hitting someone else. I've seen it happen no less than 3 times in the hundreds of rounds I've played here. Acorn has a few blind drives near very busy walking paths and a lot of holes play next to each other or the path with no natural boundaries to block stray drives. In addition, despite the hundreds of disc golfers there every day, the park is frequented by a lot of people who just stroll around the course with no regard for the danger or inconvenience.
Other Thoughts:
Acorn is an entertaining, pleasant course to play, if you get there at the right time of day. The earlier in the morning you go, the less likely you are to run into crowds, and more likely you are to find unmarked discs just laying around, lost the day before by some unfortunate beginners.
It's not the most challenging course. A skilled golfer will have fun racking up the birdies and a recreational player will have a decent chance at pars.
If you're new to the area, it's a good place to go to meet disc golfers when it's busy. If you're passing through, it's a nice place to stop by and play. If you live close by, it's a great place to play every day.
If you're looking to play a course in this area on a weeknight or weekend, go to Lakewood Hills or Kaposia instead.