Doug, I agree that there will be six opportunities to create exciting par 5s, but that is difficult to do. There will need to be great variety, center and cross bunkering, short, long, anything to avoid just hammering a second shot down there with little thought.
Based on the par 5s I saw at Streamsong, C&C are surely capable of pulling this off, but I don't think it will be routine.
Well, thinking about this on my local 6-6-6 course, I'd rate the quality of the second shots as follows:
5th hole, 504 yards - the correct play is to aim well right of the green, which sets up a pitch with a good view of the green. The more left you go the more you're hitting into a shallow green, the less visibility you have, and missing short or long can both be problems. I think it is pretty well done since the best shot is one that isn't what most people would naturally do. The only fairway bunker on the course (the other of the two bunkers on the course doesn't really come into play) is well placed to encourage people to drive to the right to miss it, and the green just begs you to aim at it, even when laying up. It takes a smarter player than most to realize that's not where you want to go. The architect tries to make this obvious by having the fairway get extremely wide off to the right.
7th hole, 539 yards - again the correct play is to aim right, but in this case because of a mound that's about 8-10 feet high that sits directly in front of the green (as viewed from where you'd play your shot trying to reach it in two) The more right you go, the more you can avoid having to play over the mound, or the consequences of the green falling away from the mound. There's a lot of room in the fairway to the right, but even missing into the rough isn't bad here, as the rough is mowed down to about 3" and rarely allowed to exceed 4".
9th hole, 545 yards - in this case you want to play from the middle of the fairway. There is mounding on either side of the fairway, which will help a slightly offline shot kick back into the middle, but knock a further offline shot further afield where you may have a blind shot, nasty stance, or more likely both. Since this hole plays into the prevailing wind, a lot of golfers will be hitting 3W to lay up.
13th hole, 565 yards - this is the "hard 5" I described before. There isn't really an ideal angle of approach, the green is nasty from everywhere
OK, obviously if the pin is on this tiny plateau back left you want to approach it from the right, but anyone who plays for that pin would have to be certifiably insane as the plateau is maybe 25' wide at best and if you miss left the ball will kick off the slope and probably go OB. It is the longest hole on the course, plays into the prevailing wind and is uphill for the last 50-60 yards so the green complex is the main defense. I guess the architect decided we deserved a break on the layup, since the approach is so testing and the tee shot fools a lot of people into aiming at exactly the wrong spot.
15th hole, 549 yards - this is the easiest par 5 (at least for me) which I can often reach with a short iron when the wind is helping. The green is extraordinarily shallow approached straight on, so you want to get as far right as possible, and the fairway again encourages this by widening out well right. There is a water hazard that's mainly in play for the 12th hole if you aim well right and miss right.
16th hole, 551 yards - this hole has an amazingly difficult layup, because it is long, plays into the prevailing wind, and starting about 160 yards short is about as steep a rise as you'll ever see this side of Painswick. What I "try" to do is hit my second up to about 80 yards short where there's a plateau where you can see the green, but it is really really hard to get it there. Most players will end up with a blind third (or fourth, if they're short or a low ball hitter)
Only half the par 3s and half the par 4s are good holes, IMHO, the rest are rather vanilla, but I feel all 6 par 5s are well done and would impress most anyone on GCA. If the par 3s and 4s were all equally strong most people would probably have heard about this course. Maybe it is a fluke that a relatively unknown architect (Mark Kerr) managed to produce 6 strong par 5s on a single course, since many seem to think that would be very difficult to do.
13th hole, viewed from above/behind the green. Teebox is in the upper right.