Pros:
A course with beautiful views and some massive elevation plays.
-Basics: Concrete tees, DISCatchers, marginally helpful tee signs that sometimes have pin position indicators.
-Scenery: Out of the many beautiful Colorado courses I played in summer 2021, possibly the most beautiful. Mountain vistas surround you on all sides constantly, and on many holes you can see the Dillon Reservoir below, which is just gorgeous.
-Elevation: Among the most consistent and dramatic of any course I've played (Bucksnort is the only other place I have in mind that really compares). Some holes are uphill slogs and some have valleys or ridges that make the shaping way more fun. The highlights are a couple of dramatic downhill bombs on (4), (5), and (7), although several others such as (18) would be elevation highlights on any other course.
-Shot Shaping/Gameplay: Varying levels. There are some wide open shots only made interesting by elevation, mainly the front half. There are a few great shot shaping holes that combine the slopes with gaps and fairways for excellent gameplay, namely (10)-(11) and (15)-(16). And there are quite a few stylistically halfway between, with some trees to deal with but pretty simple shapes--hyzers and such--to deal with. Obviously, dealing with steep elevation will also be a challenge.
-Multi-Pins: Some holes have multiple placements.
-Second Course: Having the family course on site is cool, because it's appropriate for beginners. The main course is not, at all.
Cons:
Definitely a few cons to balance out the pros somewhat.
-Blind Shots: The tee signs aren't really helpful other than describing lengths, and most shots are blind. Furthermore, the faded yellow baskets blend in perfectly with the terrain. This results in a lot of guesswork, which can get frustrating.
-Lost Disc: Due to the above con, lost disc potential is high. The elevation also hurts here, as a shot can duck over a hill and you'll have no idea which scrubby bush to look in for it. Also, on downhill bombs, if the wind takes a disc it'll sail for days, quite possibly out of sight.
-Variety: Other than a couple of long pins, all par-3s. This is rather disappointing, as you could make some epic par-4s out here. There are also a lot of shapes that are pretty ho-hum, including wide open ones. I'm curious what a re-routing of this course would do for it.
-Long Walk: It's about a half mile uphill to get to the first tee. If you play the family course first, it cuts off a third or half of that walk.
-Exposure: Brutal sun and wind on the hillside. Don't forget about afternoon mountain storms, either, and be smart about when you play.
Other Thoughts:
Lake Dillon is a truly special course for its massive elevation and incomparable views. I can see why it's rated so highly. Personally, I found the gameplay to be underwhelming for the environment, so my rating is a little lower. On the whole, though, it is a Very Good course, and will stay in the mind of any player for quite some time.