Blizard devs literally said it was bugged and we put that to rest on BL. Dont make me find it and link it! Too Late I did. Notice how it has the word Bug right in the notes.
More proof was bug fix. Thx Phatty:
I have a zillion crit damage as well and while my spear performs well its not broken because I dont run winterglass. ITs winterglass that breaks this build not spear aspect.