You can't really compare WWII dumb bombs dropped from 25,000 feet to modern precision weapons that can hit precisely the weakest point on a target, times thousands of targets, within the span of a few hours or days.
I mean, we literally just watched a massively successful strategic bombing campaign over the last week! Desert Storm was massively successful, Iraqi Freedom (the actual invasion, pre-nationbuilding part) was massively successful, Israel's bombing of Hezbollah was massively successful. I don't know how anyone can argue that strategic bombing with precision munitions isn't successful.