Well I won't deny it uses a sword but when I see people say sword DPS they mean a DPS who mainly uses sword attacks like a Samurai. From what we saw RDM won't be mainly using sword attacks even though they have a sword. Also they have been classed as a RANGED dps even though they have a sword which implies they will be Ranged most of the time casting spells and here and there going in to use the sword but not too often. just a theory of course nothing set in stone.