Concrete is WAY too energy intensive of a product for most applications. However, there are too many fallacies in this comment to ignore.
1. needlessly complicated structures exist in steel and wood form, too
2. point is unclear, but again, how is this specific to concrete?
3. same comments as 2.
4. concrete does hold together. It functions much better as a compressive material, though, which is why when there are tensile (or high shear) stresses, steel is added. There are a lot of unreinforced concrete structures. I've heard comments from a concrete guru that reinforcing any slab on grade is ludicrous.
5. concrete doesn't have to break before it works. Not sure where you're interpretation comes from, but it's off base. Reinforced concrete structures are designed for ductile failure as a safety precaution for users. This means that the concrete is expected to crack at points of high tensile stress. Engaging the steel will result in obvious indicators should the structure begin to fail. Without this, the structure would fail in a brittle fashion, which means that once the breaking point was reached, the whole thing would come crashing down on anybody who happened to be under it.
6. all structural materials in their virgin state will decompose when subjected to the elements. And it's salt transported by water that rusts the steel, not the water itself. This is one of the reasons that structures have building envelopes; to protect the materials holding up the building.
7. Uhh huh, and...
8. .. this is why concrete is mostly appropriate for large loads and long spans. Try building a multi-story building out of rammed earth.
9. wait, what?

10. Okay, woah, this has to do with building design and is again entirely independent of the structural material.
11. concrete a conductor? listen, one of the advantages of concrete is that it absorbs heat during the day and relases it slowly during the night. same as adobe.
12. agreed, unless, hold on, wait for it, you wear gloves and a mask. -gasp-! oh the horrors!! Forget abhu graib, let's go after concrete construction sites!!! Seriously, don't trivialize the word torture.
13. Call the selkirk hospital, one got loose
14. agreed
15. not even close, brother. Take a look at http://www.canadianarchitect.com/issues/ISarticle.asp?id=143336&story_id...
or do a search for fabric formed concrete.

Let's not forget that concrete has made it possible for dense urban life. Without concrete and modern steel, we'd still be limited to buildings of a handful of stories in height.