I just looked up the stats on the Masters website. Historically, over all Masters tournaments, the players have averaged 4.27 strokes. That makes it the 5th hardest hole against par.
Last year they averaged 4.213 strokes, making it the 5th hardest hole overall, and the 4th hardest par 4 (after 1, 18 and 11).
The website's description has a couple of interesting facts about the hole: "An uphill, dogleg left to a sloping green. The fairway bunkers are deep and positioned to demand accuracy off the tee. To clear them requires a carry of 315 yards. The green slopes back to the front, and a rear bunker catches balls hit too long. "This hole was inspired by the legendary Road Hole at the Old Course at St. Andrews. Bobby Jones initially disapproved of the fairway bunkers."