i had rolled a grief pb yesterday around 30 times and every single roll was terrible. i usually get only 1 or 2 "good" rolls per ladder and thats after hundreds of tries. grief is frustrating to reroll. after about maybe 50 rolls you should get a 400 damage roll but the ias usually crap thats why i mostly roll griefs on a pb and not on a zerker.
if i roll grief on a pb i dont have to worry about ias, if i roll on a zerk i need not just 400 damage but 34+ ias
and this only adds to the pain of rolling a grief.