It's not really rare. And in actuality takes a lot less work then raid and anima weapons. You can practically be in the Diadem group if it procs, not contribute whatsoever and still get a free 280 weapon. You can argue stat weights all you want but there is really no argument for that +3 WD and the +5 on main stats over the then current highest tier weapons.

People are upset and rightfully so. Players pour a lot of time into something and this to them is a huge slap in the face.