Pros:
50 Acre Park benefits from some excellent elevation, which the design makes smart and varied use of. There are some great approaches due to hilltop positioning, as well as some dramatic downhill drives. There are many otherwise-basic holes made engaging due to skillful use of the terrain's elevation. Pin positioning in general is well done, adding wrinkles and considerations that affect how you approach as well as how you drive.
The course has a bombs-away feel with lots of open shots - I can't remember the last time my distance drivers got this much of a workout - but it manages to avoid becoming a chucker's course. Out-of-bounds, hazards, elevation, and trees are in just enough force to make you mind them. How they combine is often intriguing too, with downhill shots bending around large trees and uphill slopes that require hitting a tight window off the tee. The design certainly maximizes the land. Players with max distances in the 400'-450' range will find some rare opportunities to shape lines on such a scale, while novices will be able to enjoy the course too thanks to well-laid-out short tees.
The concrete tees are excellent, giving ample room and being totally level. You're able to drive with impunity and in confidence of sure footing.
The course seems to be excellently-groomed. Navigation is easy. A portajohn is available. Parking is ample. The course is easy to find and relatively accessible by car from downtown Chicago.
Cons:
Design-wise, the open nature of the terrain caps the course's appeal for me. This is a well-laid-out par 3-oriented bomber course in a city park, but that only means so much. The play is pretty casual; if this were my home course, I'd make sure to regularly visit some more technical courses in the immediate area to keep my game up.
The course makes use of some scary out of bounds, such as an impenetrable patch of reeds and a fence that lines a local road. These can be avoided with relative ease for the experienced player, but beginners will be daunted by such threats on a few holes.
There seems to be a lot of conflict with regular park goers. The course covers the entire breadth of the park, so if someone comes here to walk their dog, picnic, or lounge in the sun, they're probably in your way. I had to ask some loungers to move, throw around some lovebird picnickers, and skip playing the long tee on one hole due to some people thinking the concrete tee was a perfect place to take a nap. And this was on a day in which the park traffic overall seemed rather quiet.
Other Thoughts:
I was pleasantly surprised by 50 acre. It is definitely a casual, open course, but a very fun and well-conceived one, especially if your max distance is on the longer side. It was nice to make use of my distance drivers for such a range of shots on a single course. I'd recommend it for a leisurely 18 holes if you're in the area.