I'm currently rank 9 and have been using the Panda's Control X-Men. It's been 2 wins and 2 losses for like 4 days in a row. Despite the shabby winrate, it's one of the better Skellige decks as long as you get 2-3 Axemen in your opening hand. It very easily beats out Warcry in power and can compete w/ other Meta decks as long as you get those Axemen. When you don't, the deck is terrible.
Warcry Skellige just doesn't give you enough power to deal w/ Consume Monsters, Memeselt, or even Nilfguard. The fact that you are taking a lot of time to set up the Warcry makes it susceptable to the opponent's board control (Lacerate, Alzur's Thunder, Manticore Venom, Yennifer, etc.).
Monsters can blow an axeman up on turn 1, then play ghoul to guarantee eat it. Meaning either you are forced to burn a Revive or permanently lose an Axemen. Even if they don't eat, Griffin or Caretaker an Axemen, they can still beat you on board, because there just isn't enough control in the deck to deal w/ their cards. Kayran is also troublesome because they can eat 3 of their own creatures lessening the value of Harold. I que into a lot of monsters and it's always a tough matchup.
Scoiatel (Control varient w/ lots of Elves and Toruviel) are also very difficult, just because they tend to gain a card advantage from their faction's passive. By choosing you to go first on turns 2 and 3, they are essentially gaining a 2 card advantage. Made even worse when you lose the coin flip and have to go 1st on turn 1. Not only that, but they have 3 Scorches (Scorch, Nature's Gift, Aglais) to counter big creatures you play. Solid deck and faction, tough matchup. To even have a chance at winning w/ Panda's deck you have to commit REALLY hard on turn 1 by essentially playing out your whole hand and hoping they don't have Scorch.
I've been trying out Swim's Harold Control deck and I definitely like it better. However, I still stand by my earlier statement that I would like to see more viable win conditions for Skellige apart from just Axemen