It may be best to consider the future before invading a country, yes.
More to the point, if the invasion is seen as a major turning point in stopping global catastrophe, whatever the feelings towards him now, he will go down as a good president. If, on the other hand, the war is seen as the catalyst for the breakdown of the Middle East leading to a World War then he will go down as bad. Same with his domestic policies.
Whether you agree or not, he can only be fully judged once his actions have played out.