Variety. There are a lot of different looks on this course, from wide-open to tight tree-lined. Bring your whole bag, and every shot you can throw.
Elevation. What can I say - I like a good hike. Plenty of hills, some side-hill lies - OU-C will give you a workout.
Beginner-friendly, but not simple. The problem with beginner-friendly courses is that too often they're way too easy when you aren't a beginner anymore. OU-C is not that way - there's plenty here for experienced players.

Maintenance. The open holes are mowed and fairly well taken care of. Looks like nobody in maintenance ever walks into the woods, though. From what I've read and heard, this isn't the fault of the club, it's the school - but it doesn't matter whose fault it it, it needs to be fixed. Tee signs are down or missing, some of the toe boards are missing as well, so on a couple of holes I had no real idea where to tee off from. Once forgiving schule is overgrown now and will devour your discs if you're not careful.

Four years ago, this was the site of my first tournament. I played terribly, and didn't review the course then. If I had, I'd have probably given it a 3 or a 3.5. I'm not a big fan of natural tees, but they were bearable since I always knew where to tee from and where I was going. Wandering the woods at OU today, I didn't recognize much from 4 years ago, and I had some trouble. Trails are starting to grow over (the opening to the path from 3 to 4 is a notable example). Tee signs are down or gone. The path from 13 to 14 is swampy. It was tough to think this was the same course.

I'll be honest -- I played a LOT better there today, but I had a LOT more fun four years ago. I was really disappointed in this course, and I'm not sure I'll make the trip back unless I hear about some work being done on the course. It's a shame that OU-C apparently doesn't care about this once-fun course.