I've spent a lot of time in San Diego since 2001 and played the South Course at Torrey Pines close to 30 times, mostly since the 2008 U.S. Open.
I don't have the length to go for the green on 18 in two. The hole offers many of the same driving challenges as many of the holes, due to sloped fairways, narrow width, difficult rough, trees to the right, and fairway bunkering.
For those players who are constrained by lack of distance and play it as a three shot hole, the contour of the fairway brings rough into play on the left, making the line of the second shot important. So both the drive and second shot require precision. The second shot requires a decision about club selection because of water in the area near the green, to insure the layup stays dry.
Other par fives, such as #6, 9, and 13 have contouring challenges which require accurate placement of a second shot for those playing holes as three shotters. The left rough at the bottom of the hill on 13 can ruin an otherwise well struck layup shot. So I think #18 is similar to other par fives.
Torrey South is a muni course. I personally dislike courses which use water hazards to excess. But I will give Torrey South a pass. It might be possible to beautify the water hazard, but functionally, it would have the same result. The playoff on Monday was determined by a second shot that came up a couple of yards short. Kyle Stanley showed another way in which the hazard can come into play.
I accept that most reviews of the course by architectural purists tend to rate it low. I doubt that the lower ranking is overly influenced by an unattractive water hazard on #18. On the other hand, there are a limited number of courses where major tournaments are held that are readily accessible.
Charles Lund