No, Blizzard doesn't have 100% chance to hit, but when it does, it can pack quite the punch compared to Frozen Orb. On a hacked char, skills all at 99, in 8 player game, it takes the High Council in the Travinical out in 2-3 Blizzards, compared to.... a lot of Frozen Orbs. Granted, it is doing 20,000 a shard and a few rain down, but for the supposed 3,000 a shard on orb, it does much better. I don't know why Frozen Orb doesn't do nearly as much as it should, but Blizzard, in my opinion, kicks much more ass than orb in 1.10.

So this baby seal walks into a club.