You'd be very surprised how often I encounter the question of Assassin's DPS in PvE. I'm sure some of them don't even use parsers but nevertheless are under the impression that somehow our DPS specs are the magic 36/36/36. I do have myself to blame for giving that impression of Assassins regardless of field.
Deception is already dumb, and so what? If it needs to be dumber for better effectiveness, so be it. Besides, there are some people who think that the 'dumb' is actually 'awesome', so it's a very subjective topic.