I agree with farranpoison. As of Gen 6, there are a lot of winners. Poison and Steel gained more offensive presence, bugs gained the must-have new entry hazard, Fire gained a resistance, and all pokemon that fear dragons, fighting types and dark types suddenly have to fear the fairies. Sure, steel lost two critical resists in return for one new one, and dragon typing lost a lot of its allure, but these types could more than afford to take the hit.
I don't think it would be a stretch to say that the Ice type is the biggest loser of gen 6. Sure, we got Freeze dry and stealth rock might not be the issue it used to be thanks to the buff to defog, but suddenly the go-to anti dragon coverage type isn't ice anymore. We have fairy now, a type that covers the incredibly threatening dragon, fighting and dark types. Sure, BoltBeam will continue to be a gold standard for neutral coverage, even more so for pokemon that get freeze dry, but Fairy makes for stiff competition offensively and completely outshines it defensively.
Furthermore, with the nerf to weather this generation, the strength disparity between hail and the other weather types has grown even more painfully obvious. While sun rain and sand have always provided a substantive benefit to their respective types immediately upon setting, hail simply does not damage ice types. Depending upon ability it may heal them or raise their evasion, but what abilities do the other weather types get? Doubled speed through chlorophyll, swift swim and sand rush. Increased damage output with solar power and sand force (on top of the damage modifications inherent to sun and rain). Finally a slew of boosted coverage moves like solar beam, thunder, hurricane, and synthesis. Hail gets Blizzard (and ice type weather ball if anyone figures that is even worthy of counting). When GF nerfed weather this generation, they nerfed all weather types as if they were all created equal. They most certainly were not, and the Ice type has consequently lagged behind.