Pros:
Rooster Rock West has some nice scenic beauty, paired with a simple, but reasonably challenging layout. The course has a nice variety of distance, with a few very approachable shorter par threes, coupled with (relative to the size and general quality of the course) a few pretty long par threes. While most of the holes are pretty straightforward Oregon tunnel-through-the-trees holes, holes 2, 3, and 6 provide for some really fun lines, with hole 6 in particular providing a really nerve-wracking over-the-water shot that is the highlight of the course. While the course does lack signage, it does at least follow a logical order with short walkouts and easy access to the massive parking lot. The tees and baskets are top notch and are generally in very good condition.
Lastly, and perhaps most importantly, this course compliments its sister course - Rooster Rock East, extremely well. Either course on its own would be a pretty skimpy destination from Portland (course is a good 30+ minute drive from town) but together they form an 18 hole track well worth visiting (though I would push any out-of-towners to one of the PDX metro areas better quality courses). My advice to a local coming to check out the course would be to play Rooster West first as a warmup, then play one or two loops around the much more difficult (but also more fun) Rooster East course.
Cons:
Lack of signage (printing out, or having the course map - available under the Links tab - is recommended)
The final few holes are largely uninspired design-wise
Other than hole 6, a fair number of the holes are too straight-forward.
Other Thoughts:
Make sure to have access to the course map. Start at this course, then drive back to the East course which is almost a mile away at the other end of the park.
For folks interested in it, the Park has one of Oregon's two sanctioned nude beaches.