This is the first set I watch from Nadal this tournament and I'm pretty sure he must have been playing better leading up to this to warrant all the praise. So far, this is very predictable, especially with regards to the serving (well, I guess throwing two doubles in the last game, including one on set point isn't predictable). On hard courts, Nadal needs his serve more than most realize, especially in tight matches. That really was instrumental in his hard court form last year, where he went through some of them most consistently effective serving spells of his career.
By comparison, his serve here looks way too predictable and harmless. It's not necessarily a matter of pace, but rather, placement and variety (or lack thereof).