Dave Arneson is supposed to have once said, "Don't ask me what you need to hit. Just roll the die and I will let you know!" What I've noticed on this blog and elsewhere is that, whenever the discussion of D&D's armor class mechanics comes up, it seems as if most referees tell the players the armor class of the opponents they're facing. I find this odd, as I don't do this and never have. At my table, the player rolls 1D20, applies the appropriate modifiers, and then tells me the highest AC his character hits. Then I, consulting my notes, determine whether or not he rolled high enough to score a damaging hit. Is this procedure unusual at most game tables nowadays?
I'm genuinely curious.