According to former President Bill Clinton "It was a big mistake..."
But in 1998 he said "Saddam (Hussein) must not be allowed to threaten his neighbors or the world with nuclear arms, poison gas or biological weapons..."
Were mistakes made in planning the Iraq war? Yes. Was it a big mistake? In my opinion no. Freedom has always exacted a high price and it has been paid in Coalition and Iraqi blood.
I suppose that one could go into the whole WMD issue. Small amounts have been found. And if the report is true there were plans to hide existing stocks. I think history will come down on the side of President Bush.
Now if we want to start talking about former President Clinton's mistakes - that might be interesting...