That's an excellent question - sounds like one I would ask myself!
On the offense side, the overall numbers look good, no question. And certainly the offense carries less of the blame.
As a general observation, it seems like the offense is not quite as 'relentless' as last year's, or this year's Yankees. They have big outbursts that pad up the numbers, then go quiet again.
In the first 3 games of the home series against the Yankees they exploded. In the 8 losses that followed they were nothing special.
The other things you have to look at with the position players are defense, baserunning and mental errors or lack thereof. Benintendi and Bradley both seem slower on D this year, for example.