Seems like every patch that has come out has boosted the Sorceress or Amazon in one way shape or form...
Maybe someone at Blizzard is the secret head of NOW and hates any and all things male so are subtly killing the "power" and usefullness of the male characters? Necromancer was done worse than the barb, IMHO.
Of course this doesn't explain the crappy Assassin, but maybe the "NOW" patch makers don't think she's a "real woman" anywho?
Just a thought..