Absolutely not. That was the single stupidest thing the US has ever done since WWII, except for getting involved in Vietnam. It's also the reason for all the problems with Iran today.
Had it not have been for that, Iran would be a secular westernized country today, similar to Turkey.
In hindsight I have to completely agree with you BRTD. It was one of the worst foreign policy decisions we have ever made. Mossadegh probably could have turned into a Persian Ataturk or he could have been another failed state dictator. Either option would have been better than the Islamic Republic and the rise of Islamic political fundamentalism.