I used Blizzspam for a bit with my old Blizzspam team with Kyurem-W > Kyurem. It was alright, but there were so many better things I could have been using, lol. Hail in general has more problems than just "not enough abusers". Specs Blizzard requires SR + Spikes to even have a chance of 2HKOing Blissey, IIRC.
Anyway, about SmashPass, it has a saviour in the form of Ghost Arceus though. Since Ditto copies the type of the form but not the type of Judgment, it becomes completely useless against Ghost Arceus with normal Judgment and Focus Blast, neither of which could do anything against Ghost Arceus.
Whatevs sig. QC member for OU and Ubers, VM me for a look at your analysis. Just make sure it's good.
Also, if you want me to rate your team (OU/DW OU/Ubers), give me a VM. If I don't rate it, it's either 1) it's so shit it's too much trouble, 2) I'm busy, or 3) the team is fantastic and I have nothing I can suggest to you. You should be able to recognise which one.