This is probably the 2nd best ski area in Washington State. The other being Crystal Mountain. I've been to all the others except Mount Spokane, and I've been to about 50 other resorts in N. America. It is not as good as any of the big Rocky Mountain resorts... it's certainly not worth flying in to go here. Thus the 4 stars.
The terrain here is varied. They have a great beginner area, lots of groomed blue trails and a large amount of ungroomed, especially on the backside. The tree skiing is decent. The lifts are decent. The grooming is pretty good.
By my casual appraisal, the backside tends to be a few degrees warmer than the frontside. So if the temperature is either too warm (likely) or too cold (unlikely), you know where to go. The base is 3000 ft and the summit is 6000 ft. Slightly lower than Crystal, but much higher than the Snoqualmie Pass resorts.