The classess that I feel would get the most use out of this are Arms Warriors and Ret Paladins.  Yes, I said ret pallies as well.  I know that everybody keeps saying all pallies should go holy, but frankly, I don't give a shit what those people think.  These 2 types get the best out of this sword, followed by the other warrior types, and hunters bringing up the rear.
And the reason a ret pally can use it so well is because they can inc the dmg by 42.46 at it's min and 63.8 at it's max dmg.  Also if they have vengeance and get 3 crits fast enough, for 15 secs, or longer if they get another crit, it increases the dmg by 100.36 at it's min and 150.8 at it's max.  Finally, with Avenging Wrath as well, min inc by 216.16 and max by 324.8.  Of course it only goes that high with Humanoids, Dragonkin, Undead, Demons, and Elementals.  This is not including any AP boost from strength, which is most likely the same as warriors.  Now, who said pallies can't DPS with these boosts?
BTW, if you want to know how it was figured, put 3 points in 2h Specialization(6% inc, 3 in Crusade (3% in both holy and melee against previously mentioned types), and 2 in improved Sanctity Aura(2%).  Vengeance does 5% per every crit, melee or spell, made in 15 secs between each, stacks 3 times.