Pros:
Lake Mingo is a shortish, nine-hole course in a public park, and an excellent place to learn disc golf. Three holes are long enough to let you learn distance. Four holes require (relatively simple) technical throws. The course opens with a shot over (or around) the corner of a lake, and closes with an easy shot across an open field. Played with the marked OB's, the course becomes much more challenging - particularly 1, 5, and 8 on windy days.
The course has nice tee pads, good signage, close parking and port-a-potties, trash cans, a water fountain by the skate park, good flow, and is easy to navigate. It is placed in a friendly, open park that is easy to find. There is almost always someone playing this course.
Cons:
The park can get crowded, and that can interfere with disc golf on occasion. I've had helpful kids a few times pick up my discs and bring them back to me. A few holes can get muddy when it rains.
Other Thoughts:
Lake Mingo was two blocks from my house for years so I've played it 100+ times; it continued to be reasonably enjoyable after all that time. I really like the new over-the-lake shot on #1. I've heard folks complain that the course is too short, but then I've seen the same folks turn in high scores. Lake Mingo is a beginner's course, but it's more difficult than it looks.
Feel free to throw when the geese are in your way; they are used to discs and will impassively dodge your throws. But beware their ample droppings.
#4 pin has moved to the left. It is now guarded by the trees and culvert. And, as noted above, #1 is now a shot over water.