Pros:
Playing a quick round here is easy -- it is never crowded and the 9 holes take under 30 minutes either alone or with a small group. The holes are fairly basic, but there are a couple longer, more difficult holes that stand out. There is a lot of elevation change in play here, which is unusual for a course this short. Someone has taken creating signs into their own hands and scribbled an approximate distance, basket layout, and next tee arrow on the wooden posts by the teepads, and frankly this might be the only time where course graffiti has been a plus.
I do want to highlight Holes 5 and 9, as they stand out above the rest. Hole 5 provides a lot of distance (my guess is 410' or so) with an appreciable amount of trees in the direct line of the basket. Hole 9 is also long (430'?) that goes over a valley of sorts and forces you to throw a long straight shot, otherwise the disc will hyzer into the woods.
Cons:
The baskets are bad; they are often bent and do not catch discs well at all. The layout is pretty bland beyond Holes 5 and 9, many involving straight shots with some elevation (which is nice) but very few obstacles otherwise (which is not nice). When a baseball game is playing, holes 7-9 become unplayable due to parked cars along the road that meanders past these holes.
However, the most frustrating part of this course is navigation. There are no tee signs on this course (the graffiti work mentioned in the pros doesn't count it) and no signs within the park at all acknowledging the course is there. There are several long walks between holes, notably 6 to 7 which walks all the way to the other side of the baseball field (at least 600' from pin to tee). Some teepads point toward multiple baskets (3 and 5 come to mind), so unless you know the course layout, it is not entirely clear how to play it.
Other Thoughts:
Highland Park is an average course layout with terrible "extras" (baskets, signage, local support) that is only worth playing if you are in Fort Thomas. I grew up within walking distance of this course, and it was always easy to go and play a round or two (or five) with friends or by yourself to work on your game. It holds a lot of sentimental value to me, but I just played there today with the mind of someone who had never played there before and frankly, it is not worth it. If you are looking to play a semi-quality disc golf course and do not live within about ten minutes of this course, it is not worth the visit. There are an abundance of good courses throughout the Greater Cincinnati area that deserve to be played more than this one, and unless a significant amount of work is done to improve the course features, it will not be a destination.
Frankly, this was a hard one for me to rate, having known the course for so long and having seen it be "redesigned" a bit over the years. I couldn't decide between a 1.5 and a 2.0, and ultimately went with the 1.5 because if I was not familiar with the course, I would not know how to navigate it. If some money was put forward and someone with an eye for disc golf came in to better locate some of the baskets, I think a fairly strong 9 hole course could be here. However, having grown up in Fort Thomas, I do not see the city doing that.