Complete bummer. This is why having long term expectations about a reliever is dumb. I don't recall anyone saying he had a bad motion or build. Sad to say, but the Nats probably exploited the releiver bnurnm out rate very well with Chad Cordero and Luis Ayala.
This makes Rivera all the more remarkable, and probably confirms why Papelbon will never be signed for more than a year by the Red Sox.