depends what you are using them for, if they smell good, I would certainly use them for late additions. The question mark is their bittering abilities really.
as a reference, I just used some leaf hops from '09 and were not treated well before I got them, meaning they were in a room, in a zip lock for at least a month before I got them ( I had a friend that was a hop farmer that pulled a few pounds from each crop for me and then sent the lump sum) at any rate I was hesitant to use them but I just did recently on a simple pale and man they still have a punch.