Pros:
A super short par-2 course with good fun factor, making a nice warm-up or cooldown from the main course.
The Bluebird putting course is a great compliment to the big course on site. It's 20 short holes with easy flow, virtually no transitions between tees, DGA baskets, and clearly marked natural tees, which are entirely sufficient for a course of this length. Tee signs are perfect--rather than a diagram, they have a picture of the hole with colored outlines of the tees, which are honestly better than a sketch for a course this short. It even has multiple tees indicated per hole, though I'm not sure why you'd use anything other than the longs unless it was some kind of organized play with bounties.
The longest hole out here is 170', with most playing shorter than that and quite a few under 100'. From the golds, it ranges from long jump putts to gentle approach shot-type throws. If you don't hit an ace, you'll probably be disappointed. From the shorter tees, you'd better can multiple C2 putts in your round.
It could be the boringest course ever, but this is a remarkably well-designed course. Trees, water, and elevation are used to the max out here to give it refreshing variety. The back half is longer, and introduces the possibility of bogey 3s quite readily if you don't pure a tunnel shot.
It's a super short play, obviously, but a lot of fun. Being located right at Beaver Ranch is a big pro, too. There's the pro shop as well.
Cons:
Not really much to speak of.
The only real issue is that the course is a little cramped. You need to use a lot of caution to avoid hitting guests walking through to the pro shop or players in front of you.
Otherwise, the course is notable for what it's not. It's not a course you can drive on, or throw anything faster than a putter. It's tiny. So I guess that's a con, built into the nature of the course.
You have to pay to play, but nobody's coming out to just play the putting course, and the fee is well worth it to play the main course.
Other Thoughts:
The only course of this nature that I liked more was Flying Armadillo Gold, which has an extra gimmicky fun factor that's not present here, where every shot could be found on a normal course's approach shots. Bluebird is very well done, and a fun time. How do you rate it in relation to other courses? No clue. The adjective that most came to my mind after playing was Good, so that's what it'll be here.