http://natsinsider.com/2014/07/23/instant-analysis-rockies-6-nats-4/Quote
I think Nats fans are starting to feel disappointed that Harper and Strasburg, so far in their careers, are both vastly overrated compared to the hype that surrounded them when they were drafted. Two “once in a decade” talents ought to be playing at Kershaw and Trout levels. They may yet reach those lofty heights, but if they were already the Nats would easily be the best team in baseball by a comfortable margin. And yes, it’s hard to keep being patient with them and hoping they take it to that next level.
http://www.thedailyaztec.com/53471/sports/former-aztec-strasburg-struggling-in-mlb/Quote
Strasburg has never been the same since his injury and many people have pointed to his mechanics as a long-term issue that might affect his career moving forward. Even before his surgery, scouts were concerned with how he pitched. The sequence of Strasburg’s delivery places a great deal of stress on his arm, placing him at greater risk of elbow and shoulder injuries.
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Strasburg's fastball doesn't really have a lot of deception. Hitters seems to pick it up well and since he only (or mostly) throws a four-seamer he doesn't get as much action as you would from a two-seam fastball.
It's possible that Strasburg has pitched in some bad luck this year. But there are also clear indicators that his ERA is higher than his FIP for reasons other than bad luck and bad sequencing. Obviously, as the strikeout numbers indicate, when he does get ahead in the count he has deadly wipeout pitches with his curveball and changeup.
But his fastball isn't a great pitch. Until his command of it improves or he can more successfully paint the corners or develop a two-seamer with movement, Strasburg won't develop into that ace we keep expecting him to turn into.