Huck, I'll expand more later, but one answer is, similar to the first hole, the hole is challenging for all levels of players. I can't think of too many other non-driveable, sub 350 yard par 4s where that's the case.
There certainly are options with decisions - favoring side of the fairway brings the bunkers into play. A nonchalant layup to the left fairway yields a VERY difficult wedge shot, even for the best players. Some might say the fairway is too narrow to favor a side, but remember, most are teeing off with long irons or hybrids.
If I were Fred Funk or Joe Durant, I might even think about driver/half wedge, to keep the spin down.
I need to pull out my tape of the 94 Open, but I think in the playoff, all 3 guys were over par through 1 & 2, and I think someone even doubled one of them.
One thing is for certain - there's no hard par, easy bogey at Oakmont.
Everything's hard.
But also fun.
Thanks Mark, John and Ryan for the added info.