Matt,
I'm a fan of the non-traditional routing of holes on the two nines, not because they are non-traditional but because I think it works. I don't think it reflects much thought on the part of people that react either positively or negatively simply because there is a different mix of holes (this comment isn't directed at you - I've just seen a lot made of this on threads about PacDunes. I think Michael Dugger said it well. At the end of the day, the mix is pretty darn traditional (only one more par 3 than the norm) it is just the sequence that throws folks off.
Back to the point of the post - You seem to concede that the par 4s and two of the par 5s are clear strengths, so I'm going to try to focus on what I enjoy about the par 3s and the other two par 5s.
I'm not trying to change your opinion. You've seen and played more than I ever will and I respect your thoughts. Hopefully this will provide you with some insight as to why I find the holes (and the course) so enjoyable.
#5 - This hole probably grew on me more than any other the 2nd time I visited Bandon. The first time around it was over-shadowed by the numerous great par 4s on the front nine and the scenic, ocean par 3s on the back nine. The 2nd time around, I paid a little more attention to this one. The look from the tee is one that I really enjoy. I like the green contours and I love the hidden sweet spot in front of the green. There's nothing better than hitting is just short enough, watching it disappear for a moment, re-appearing on the green, and watching it roll up near the pin. I like that one is afforded the opportunity to play it a little lower under the wind and run it up. The bunkers provide a stern test for errant shots influenced by the wind.
#10 - This more than any other hole that I'm going to try to defend is about aesthetics for me, so I'm treading on dangerous ground here with respect to golf course architecture. I think the tee shot has more merit from the lower tee, but I prefer the upper tee here. I love hitting down to the green that sits in a bowl here. It's a comfortable shot, nothing tricky, but the green is large and the scenery tends to lull me into complacency here. I'm usually around the green rather than on it, but I'm not sure if I've ever used any club other than putter after my tee shot here. As I've stated before, I love putting from wherever possible at PD, and I think the vast green area here with no serious bunkering allows for some real opportunities for a little creativity with the putter to make up for a less than stellar tee shot. I think the multiple tee locations adds to the allure here.
#11 - I think this one is world class. Does the ocean help even though it really isn't in play? It doesn't hurt, but I think this hole stands on its own. I've played this hole on days when I needed a 9-iron in the morning and a 6-iron in the afternoon. It's a great short hole with a matching small green that demands precision. The long, narrow bunker on the left side is dangerous, but a more welcome alternative than tumbling over the cliff. I love how this hole looks like completely different from the tee than it does from behind the green. The treacherous bunkering awaiting a shot that gets held up in the wind is all but invisible as you walk off to the 12th tee.
#12 - I think that the fact that this is a par 5 certainly has to do with a need to fill some space between the obvious locations for #11 and #13. Might this one have been better (or certainly as good) as a long par 4? I think so, but I don't think it is a bad par 5. My enjoyment on this one really takes place from 150 in, which is why I don't think the par of the hole really matters. I think the green complex is a little more deceptive than it appears. I've had some tricky putts on this green. I also like the humpy-bumpy fairway running up to the green. I've putted from 75 yards out on this one, and I've also played bump-and-run shots. The terrain allows for a great deal of creativity. I actually enjoyed both #12 and #15 better than #18 the 2nd time around.
#14 - My volatility probably adds to my enjoyment of this hole. Short and seemingly innocent, I've made everything from 2 (on a late night second ball) to 8 on this hole. I've played from just about every bunker within 100 yards of this hole - including at least one of the fairway bunkers on 13 (after a shot from the front left bunker went terribly wrong.) Like so many other holes out here, the wind can really wreak havoc on the tee shot that is usually played with some sort of wedge in the summer wind. The front pin position is really enjoyable as the golfer trying to stick it close has little room for error.
#15 - Another one, like #5, that shot way up on my list the 2nd time around. Club selection off the tee is critical, as we found the bunkering at the narrow neck came in play with even less than a driver in the summer wind. I love the bunkerless green, and I found the fairway bunkers to be in perfect position to catch a low-running, long attempt to reach the green in two, though my playing partner showed twice in one day that they were also easily carried with a well-struck shot. The hump in front of the right side of the green is the perfect complement to the sandless complex. I also noticed a lot more undulation on this green with some of the pin positions we encountered last year.
#17 - In the 7 rounds I've played here, I've used as much as a 3-wood and as little as an 8-iron, depending upon the wind and the location of the tees (I've always played green tees, but they've been in several different spots.) In 7 tries at this hole, I only hit the green once. Even more remarkably, no one else in any of my groups hit a ball that came to a stop on this green in any of those 7 rounds. Chalk it up to our in experience in handling a Redan. Or maybe it was the wind. Or the dastardly front right pin location we encountered on the last day (it really was hard to convince yourself how far right of the green you needed to aim.) I thought it was a great finish to a demanding set of five par 3s that demonstrated remarkable diversity.
I don't really care if anyone is reading any more. I'm back in my happy place. Sweet dreams!