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I don't think it's normal but I'd wager it's better than most other things. Gen I is Pokemon in its closest form to Game Freak's, and more specifically, Satoshi Taijiri's, original vision for the series and it comes through in most elements of the franchise, from the games themselves, to Shudo's anime, to the original volumes of Pokemon Adventure.
On a purely gameplay level, the Gen I games are undeniably rough around the edges, but it's also the point of the series with the least amount of corporate meddling, which only increases from then onwards.