If you've ever played with a hunter, then you know that every weapon is a hunter weapon. Either they need to gear for some special gear set they're working on they're hoping that Blizzard allows them to use maces and wands someday. Polearms, swords and even daggers can all fall prey to their instant need rolls. I'm just happy that they're not allowed to equip their pets with gear à la Diablo II, or else there would be a massive weapon shortage.
Rogues, on the other hand, have very narrow weapon requirements. In most cases, weapon speed can trump nearly any other stat weight, due to specific mechanics that favor a certain type of sword or dagger. While Cataclysm has promised to roll all weapon types into a single, balanced specialization, we are currently forced to pick our instruments of destruction carefully.