Yeah, it seems very unfair. If Party A has 60% of the seats in the state legislature, and Party B has 40%, then intuitively it feels like Party A should get 60% of what it wants. But as you said, Party A actually gets more like 100% of what it wants.

This is a thing where having more parties would really help. If there were (say) 4 parties, each with ~25% of the seats, then they would have to bargain with each other and form coalitions, which I think would be a really healthy process for democracy.