Voltaire said, "The best is the enemy of the good."

John Miles rephrased it for the Direct3D/OpenGL battles back in 1996 or so, and I like his version even better:

The good-enough is the enemy of the excellent.

I'm an idealist at heart and a perfectionist in practice, and every time I watch something that's merely good enough destroy something that's excellent, I die a little inside.

Here is a related rant about how to judge the goodness of something.