Yes may have been a little generous ... but is only slightly above AA output. the X multiplier probably need not be so strong across the board and apply moreso as the berzerker's... it is a snipper however and should probably be treated more as such.
What may seem overpowered as the crit threat and multiplier tapers off tremendously at elite high levels as the mob start to get fortification. Come raid end-boss where they have tens of thousands (if not above 100 thousand) of hit points only few things matter. Also, as stands berzerkers, kensai and many classes one or two hit trash mob as is... all but epic does this occur and there - a deepwoods would have to use many hundreds arrows per mob as is.
+Hide and move silently in this game is typically used for stone retrieval at lower levels (Even most high end assiasins take only take that PrE for the level 18 feature rather then the assasinate - because even with faster sneaking most good groups move at breathtaking speeds). Poison immunity a nice gesture however near everyone is immune to poison via item, race or - as rangers carry - the spell. Rangers in themselves are easily survivable without much fluff... heck build umd into one and they need noone as is, Solo is achieveable easily on any character ... can take a Barbarian into Sins and solo it should I want. Deepwood would still be a black-sheep pre.
Currently there are two paths for rangers Tempest and AA - Deepwoods being as relivant and next to no PrE at all. Ranged combat in itself until the recent AA changes was exclusive use to manyshot and in many ways still is... the best of AA or Deepwoods also carry IC : (something else) on top of IC : ranged... Why? Well 43 (50 with capstone) attacks per min is not so cut and dry with the output of the 132 attacks per minute of a melee. Nor do I think it should be as there is far less jepardy from shooting Harry from across the room in part four of shroud... manyshot as a burst is devastating... even moreso on an AA. Sport an AA with a lightning II and it clears things up quick with manyshot... manyshot cooldown on and they take to thier twf.