Pros:
This course is great for practicing a variety of shots. If you ignore the standard tee boxes, you can artificially lengthen the holes and create more of challenge for the shots in your arsenal.
It's also on school property, so the area is well kept. Families will enjoy the length of the course (9 holes) and the setting, while better players will appreciate the opportunity to work on a few shots absent the crowding and pressures of a full course.
Cons:
Not a lot of room to work with. That, and the fact that the course was designed for school students makes Belle Sherman fairly limited in scope. Holes are very short, and there's only 9 to work with rather than the full 18.
Veterans won't likely enjoy Belle Sherman for anything other than the occasional warm-up or practice round.
Other Thoughts:
Chances are, you're coming here to practice, not to play. For that purpose, the variety of holes is fairly ideal, although a most are a bit short for bigger and better players. This is easily remedied if you're willing to move around a bit and get creative.
Because I don't really view this as a "course" per se, the rating is low. It's not likely you'll want to make a trip here from out of town, but if your living in Ithaca it's a convenient place to work on your game.