Only played one slope so far: Ski Sunrise in Wrightwood CA. Its designed by a professional (Dave Dunipace), so, you know. It's good
Hah but in all seriousness, it hardly ever throws up or down an actual ski slope. Most of the course is in the woods and that makes it pretty cool. Sure, we spent a lot of time looking for discs in brush, but that was to be expected. There is only ONE crazy long epic downhill, and that's really all the course needs. Otherwise, its all professional.
I will be checking out a couple more this summer, at the very least:
Jackson Hole Ski Area (only a 10 hole, but I hear its pretty good)
Grand Targhee Resort. I hear this one is fairly short and flat when compared to other slope courses.
I think Mt. Baldy in Southern California can build an AWESOME course in their notch area. It's relatively flat but has some fantastic sloping features. I emailed them a pretty professional letter but they never responded. I emailed them a pretty un-professional letter about them charging $50 for mountain biking this summer, which is crazy because even REAL resorts charge less than 35. But thats a different issue, and they never responded to that one, either.
Anyway the point is, if they just put tee pads and baskets up and down the runs, well sure. The course will suck. If its been fine tuned by, say, Dave Dunipace, you might have something to write home about.