Check out this quest http://thottbot.com/q9710 . Its the last part of the chain for the BE palys thats reward is a polearm. If youve ever done it, its a pain in the ass, but it leads me to believe that polearms are most definently a ret paly weapon.  This weapon is really good if you dont care about how much hp you have, ie. you arent a noob and you wont pull agro dpsing.  I personally believe the halabard of destruction dropped by the high warlord in BT, cataclysm's edge dropped from archimonde in hyjal, or the soul reaver dropped by teron gorefiend in BT are all better choices for a paladin.  As posts above said, pug raids can kill the trash in the sunwell, which in the end might mean this is the easiest of the four to get.