The other comment is right: it's what the people do that determines whether most forms of government turn out good or bad.

But if you want a white pill (clear pill? whatever the any-race nationalist one works with), then you might consider that there probably is a state structure appropriate for any given race or tribe to thrive under. Any advocate for racial self-governance (e.g., GLR) acknowledges that the form of governance will vary between peoples and places.

So, is a constitutional republic doing bad things to you or me? Sure. Does that make it bad? It might. Or maybe it's just not right for the demographics in which we find ourselves, in this Current Year 1965+X.