It's open for debate. I get the feeling that most people will call La Russa a crazy old man, but is there something to the strategy? How good does your #3 hitter have to be? How good or bad of a hitter does your pitcher have to be?
Is this even debatable? Some studies say that there might be a statistically insignificant benefit. Is there a psychological one?
Also keep in mind that La Russa once thought it would be a good idea to drive drunk. Don't let that sway you though, even though I just asked you to keep it in mind.