http://www.ownedcore.com/forums/worl...verything.html
Guide to hunter from TBC; note that BM dps is focused around 2 buttons:
1) A macro set up to handle kill command and steady shot
2) Kill Shot
Serpent Sting would be needed for optimal dps, but the general point still stands.
Now, where is the hard evidence that mana is superior to focus to the point that many hunters quit because of the removal of mana and would return to the game should mana return?
Edit: And I don't think "switch to viper for low priority shots when mana is needed, then switch back to hawk for the more important shots" is any more involved than "make sure your focus is high enough to hit your signatures when they come off cooldown, instead of wasting it on extra arcane shots"