A fair question, but who are we to answer it? Isn't it up to the people of Iraq to decide? Would you want them deciding for your country that invasion, war, and mass death and destruction are worthwhile?
I understand that most Iraqis couldn't express themselves politically under Hussein, but we have no business making this evaluation for them now.
Most importantly, as many do, the question omits what is by far the most important factor, the costs to the people living in Iraqi. Think about it: How many Iraqis died? Were injured? Lost their homes, livelihoods, and dreams? [1] Do you know? I doubt even 1% of people in the invading countries can answer the question, and (IIRC) the U.S. military didn't keep track. Think about that: We invaded their country, cause mass death, and nobody gives a shit about dead Iraqis. When discussing the Iraq War, when is the last time you heard someone even bring it up?
Let's also remember the other costs: Their nation, its economy and its institutions are in ruins for a generation at least. Their own government doesn't even control large parts of the country, other foriegn powers such as Iran and U.S. decide much of what happens in your own country, many Iraqis now live under ISIL's brutal oppression, and you can't even field an effective military. If you were and 18 year old Iraqi in 2003 and planned to go to college, maybe to become a developer or doctor, where are your dreams now? If you survived, maybe you are now a 30 year old former militia member with a high school education, without skills or prospects in a sea of economic and political desolation. [2]
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[1] Over 100,000 died, by the most conservative but serious estimates I've seen. I recently saw a politically conservative publication say it was 150,000.
[2] I don't know enough about Iraq to know what a typical life story would look like, and probably few went to college before the war. But whatever their dreams and plans, they certainly weren't this.