There is no good wars. However, comparing Syria and Iraq is dumb. In Iraq, the US conducted a ground war invasion on the country after creating phony reports of WMDs in that country. The result of the idiotic war in Iraq is several 100,000 American casualties (that include dead and wound) with a total cost of trillions to be paid over decades. All this to find fake WMDs.
In Syria, the aim is a very limited air strike with no ground troop involvement. The end costs in Syria will be minimal compared to Iraq and there will likely be no US casualty.