Sample size, sample size, sample size!
Remember the thing that increases the accuracy of whatever the available data happens to be?
The offense has stunk it up, there is no denying that, but the hitters have had to face some pretty good pitching so far too.
Matt Garza has great stuff. Scott Kazmir may have a little Dice-K in him, but he too flashes brilliance at times. James Shields is either a good pitcher or a great pitcher.
Joe Saunders is solid, maybe better. Jered Weaver is above-average, and he too might be better.