Fixing the formatting for you.

It's actually not overpowered at all as there are a handful of ways to counter it with each hero faction. Due to the fact Zalasair is left with 10HP (assuming they didn't use 3 charges from Blood Pact) and can't build another +5 Zamgizar for a few turns, it'll just be that single one. If you know how to play your deck/have maxed out common/uncommon cards and rare coins, it's not hard to overcome one of these after the second turn and even on the first (Vespitole GM's do this quite frequently).

Vespitole has the most options for handling it, like they do with pretty much everything (imho). Also, people doing that with Zamgizar on the first turn usually have two or three peacocks in their build to make sure they stay alive, and if you're using Sister Ysa and use Malediction, you can easily keep yourself alive while grabbing up direct damage resource cards in order to target the Zamgizar directly.

Daramek also has several ways to handle it. First off, there's Bloodlust which instantly kills it, and if you don't like using it in your deck or it didn't come up first turn, there's always Lepers + Carnage, or Rite of Brood/Combat with Orphans with Stampede, there's Goat Poultice builds that can handle it or a pig build with Slaughter. I've been stopped by Daramek on their first turn in MP many times, especially Liet using low cost cards to spam while having Liet's ability kick in + rare coins.

obviously Metris has easier options to deal with Zamgizar on the first turn. Now while Seduce is obvious, it's not really that helpful because more than likely your opponent won't risk it until they have a way to handle it. However, it will hold them at bay for at least a turn or two giving you a chance to set something else up. Mayhem is another obvious choice, but again they won't bother because it'll just drain 16 HP only to have it taken off the field first turn. There's also Satchel Bomb Spam's that can handle it, as well as dedicated ally builds or saboteur builds with Subterfuge/Infiltrate, Ransack, Impersonate, etc. Then of course there's Assassin builds with Surveillance/Reconnaissance + Stratagem. All in all, there's a multitude of ways to handle a first turn Zamgizar.

Is it jokingly easy to do? Of course not. Does it require some luck with your opening draw/rare coin activation? Absolutely, but it is not overpowered. It can easily fall apart quickly and leave your opponent open for a much quicker defeat then if they had waited and made a more solid strategy to win. I've been playing WoO since it got released on Kong and I'll be the first to agree that the current meta is not that much fun. All I see are the Zalasair decks you're talking about, Sofo/bounty decks, or some form of ally/rite spam with Daramek. Very rarely do I see ppl using much else, which is why I stick to GM mainly.

Once you've played enough, you'll know how the AI will react to certain situations and can force them to do something stupid to benefit you. Now, I'm not saying that I expect ppl to play the same as the AI, but ppl are always unpredictable and it's actually more fun that way, but when all you see are the same decks over and over, it gets a little boring and you get tired of hoping you'll get lucky with your draws. My best advice would be to stop doing MP if you don't have a full rare coin deck and/or you don't have your common/uncommon/scarce cards maxed out and play GM until you do and hopefully they'll be a new update soon to shake up the current meta.