I...don't just assume it's about the numbers? My priest was created the day the game launched. The question for the thread is: how hard is it to pug as a returning shadow priest?
The answer is: about as hard as any class that isn't considered meta, however the spec is in a pretty good place in terms of power for difficult group content if you can get over that hump. It is, however, one of the weakest specs for solo content.