Yea, sure, look at low ranks and how good is Mage there. Especially after few days of people trying greedy Renathal decks that greatly benefited both Mage archetypes, that are otherwise quite mediocre (remember Mech Mage was always considered worse than Naga and got no new cards since, Big Spell Mage was a joke). Their winrates are artificially inflated and will plummet very soon.
So good luck leveling with Mage. Especially Big Spell Mage which, though not very good, is thoroughly hated, and gets BMed literally each time when losing. And you will lose A LOT.
Mage has 2 decks right now (post-patch) in tier 1 at ranks diamond and legend. You can argue about them being top tier or just taking advantage of a shifting meta, but you cannot deny they are "up there":
Definitely had worse times. The most notable I recall was the mean streets pirate warrior era. Mage just couldn’t do anything against the aggro and the control decks had way more value than mage could ever have. While mage definitely wasn’t the only class suffering at the time, I do recall people trying to make the secret package work to no avail at the time, the class just didn’t have any redeeming factors in that meta game. This led to it being borderline unplayable in both wild and standard. It sounds like it’s struggling a bit a standard right now but in wild quest mage is a great pick. Aggro is dead outside of pirate rogue and therefore taking infinite turns is relatively easy and leads to tons of free wins. I wouldn’t be surprised to see the deck get axed just due to how utterly unfun it is to watch yourself die for 5 minutes, but for now the deck is genuinely good in the meta, even mech mage can pull off wins with the right hand.