My rule is that it has to be an enjoyable experience in the game's current state. Factorio was fantastic years before it left early access. I bought Space Engineers practically as soon as it hit, before there was even proper weapons in the game, and I had a blast building space ships.

I'm holding off on Palworld. I'm sure what's there is enjoyable for many people, but I'd like to see the endgame fleshed out a bit first.