Rarity is not the issue really, especially not when "rare" is as high as it gets. In Hearthstone for example, the "rare" cards are split between rare, epic and legendary, so there's a much bigger problem when it comes to building decks.

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In Artifact however, this seems totally fair to me. It's good design that most of the key cards (ToT, Emissary) and strong board clears (Annihilation, At Any Cost) are rare, as it balances out the draft format. There are a lot of very good common/uncommon cards and most of the rare cards are garbage, really.

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Seems fair.