Pros:
This is a really great course... it is tough, with some long and unusual holes through some tight trees. It is also is one of the most beautiful disc golf courses out there, weaving through a beautiful redwood forest (which coincidentally was where the Ewok scenes in Return of the Jedi were filmed). Lots of tough shots, and tons of fun. There is a cool water hazard shot where you have to tee off over a small, muddy pond, and if you have a bad shot are likely to lose your disc into the water. Another really cool feature, is that the tee for one of the holes is on top of a giant redwood stump. Also, some of the best chronic you will find is usually being burned throughout the course... be nice to the locals, you may be rewarded.
Cons:
This is very much a homemade course, which was made and is maintained by the locals who play it. As such, it is not as well maintained or professionally laid out as some courses. There are no cement tee pads, or signs, so the course is hard to find your way through if you are playing it for the first time (although everyone up there is really nice... if you get lost just ask, you may make a new friend). I rains all of the time in Humboldt, so the dirt tee-pads, and the course in general is fairly muddy (I recommend hiking boots, or at least some shoes you don't mind getting dirty). Also, the fairways have lots of thick ferns and undergrowth, so it is easy to lose your disc if you aren't careful. Finally, some people are bothered by the fact that most of the course has tone-poles instead of regular baskets, but to me, this is one of the charming aspects of the course, which was literally put together by local players on their own.
Other Thoughts:
Great course, tough holes of all sorts, very beautiful, and in Humboldt... what more could you want? I can see how people (like the guy from Maine who gave the course a bad review) would not like it, because, if you are playing the course for the first time, and you don't have someone who knows the course with you to show you around, it would be really hard to find all of the holes, but, once you learn it, this is one of the funnest and most beautiful courses around... my favorite course other than Dela.