This may not be a popular choice but the 18th at Torrey Pines was terrific in the Open, even when played with the tees way up. Had to hit the fairway to go for the green, which strikes me as a fair requirement. All Rocco needed to do was birdie it on either Sunday or Monday and he'd be champion, while Tiger had to birdie it both days in very different manners. The hole was real difference maker, which must reflect the design/setup.
I think what makes the hole is that stupid looking pond, which forces guys who miss the fairway to lay up to a full shot. Take the pond away and they might try to knock their second shots closer to the green from the fairway bunker or rough, leaving a chip or bunker shot instead of a full wedge. The pond makes for more scoring dispersion.