It's too early to say anything. You have to always remember he is a rookie and he will get roughed up every now and then. Has Hamels lived up to the hype? Has Billingsley lived up to the hype? It's not everyone who can come up to the big leagues and perform like Jered Weaver.
And that doesn't mean those pitchers are short of talent or will never be able to put up nice numbers in the Majors. Sowers was able to keep the Yankees to only 2 runs in 7IP last start. Not bad at all.
Be patient with him.