Limitless summed up my Snover thoughts; it's not a great mon itself, but it's certainly not playing 5-6 like some folks claim. It handily breaks common leads like Nidoqueen and Aero, and even Ice resists switching in won't enjoy eating 2 Blizzards, an Ice Shard, and 3 turns of hail damage. It can soften up teams and leave them more vulnerable to Blizzspam, but I don't see it as an overpowered strategy at this time.
I don't see Nidoqueen as broken in this meta either. Blizzspam does her in, the plethora of bulky Psychic-types do her in, and faster offensive threats like Sceptile do her in. She's still a dominant, powerful force in the meta, but Snover's presence has put an extra burden on her that keeps her in line.
And finally, there's Cress v.v
Cress completely owns this metagame. If you aren't carrying at least 2 checks, you'll get wrecked by at least one of her sets. Even then, nothing is really countering her. She walls an impressive array of Pokemon, but she's not just a sitting duck in the process. She spreads paralysis, shuts down hail with Sunny Day, bulks up teammates with dual screens, or just sets up for a sweep of her own.
I love Cress, she's won me many a game that I should've lost, but damn, this thing is an unhealthy presence in the meta right now.