Ok, you asked for it. I've played 94 or so courses in Oregon so I went ahead and deciled them all. I put ten in the 1st, 2nd, 9th and 10th deciles and 9 in the rest. There are only about 10 "good" courses in Oregon that I've never seen and I don't think any of them would crack the 1st or second decile.
The thing I like about this list is that it doesn't require me to say if I like Astoria, Eugene or Crosswater better than the other one, which seems kind of silly since the are all very different. The only time I have to make that call is between deciles and then, if I just go see a few more courses, the favorite on the second group can move up. Since I've played a lot of the crappier courses in Oregon as well as the good ones, I can feel pretty comfortable that a course that is near the bottom really deserves to be there and wouldn't move up much if I saw the rest of the courses. Because there are many courses that some people just refuse to play (dare I call them "elitists"), to do a definitive version of this for an area would require input from many people.
Here is my list:
1st Astoria, Bandon Dunes, Columbia Edgewater, Crosswater, Eugene, Pacific Dunes, Portland, Pumpkin Ridge - Ghost Creek, Pumpkin Ridge - Witch Hollow, Waverley
2nd Broken Top, Eagle Point, Eastmoreland, OGA Members Course at Tukwila, Reserve - Cupp, Reserve - Fought, Salishan, Sandpines, Tokatee, Tualatin
3rd Aspen Lakes, Heron Lakes - Great Blue, Oregon Golf Club, Riverside, Running Y Ranch, Sunriver - North, Sunriver - South, Trysting Tree, Willamette Valley
4th Coos Country Club - Original 9 only, Diamond Woods, Emerald Valley, Gearhart, Glendoveer - East, Heron Lakes - Greenback, Langdon Farms, Michelbook, Pendleton
5th Black Butte - Big Meadow, Creekside, Eagle Ridge, Forest Hills, Grants Pass, Myrtle Creek, Persimmon, Salem, Shadow Hills
6th Black Butte - Glaze Meadow, Eagle Crest, Glendoveer - West, Indian Creek, Juniper, Meadow Lakes, Quail Valley, Rock Creek, The Dalles
7th Alderbrook, Arrowhead, Broadmoor, Colwood, Corvallis, McNary, Meriweather, Mountain High, Quail Point
8th Cedar Bend, Cedar Links, Charbonneau, Claremont, Illinois Valley, McKenzie River, Progress Downs (original), Santiam, Shield Crest
9th Coquille Elks Club, Echo Hills, Gresham, Lakeside, Manzanita, McKay Creek, Middlefield Village, Oak Knoll, River's Edge , Umatilla
10th Dutcher Creek, Evergreen, Orenco Woods, Pine Hollow, Ranch Hills, Stewart Meadows, Stewart Park, Sunset Grove, Vernonia, Willow Run