I find their matches utterly dreadful. This is the reverse of the Sampras/Ivanisevic matches at Wimbledon. Endless rallies on nearly every point where it just comes down to the first guy to make an error...and then, the first guy to get injured (and not just playing possum, which both are likely to do as well at certain points).
They claimed the AO courts were playing faster this year, but I didn't see it. Not fast enough, guys.