Yeah, it's not like any players that didn't participate in the WBC are sucking so far this year or anything... Oh wait.
Correct me if i'm wrong, but wasn't Roy's velocity down to around 88-90 during his struggles at the begining of the year last season? Once his velocity returned his hr/rate went down along with his ERA. Throughout his whole career he seems to have a month or a few weeks in which he goes through a "tired arm" phase marked by decreased velocity. He's in his 30 now with a ton of innings under his belt but, still, I wouldn't be particularly worried. He's as consistent and safe a bet as any starting pitcher.
