Well I would disagree a bit but not to get the ARF bashing going.
I think anything that is pre-fabricated is an ARF. If the model comes pre-built and covered it is an ARF. I hate popping into a thread where someone post (P-51 Build Thread) for example to see someone is assembling an ARF. Sorry but assembly is not building. I enjoy browsing build threads and watching what people create while building. Most kit/plans builders after they have a few kits under their belt start to modify and change the kits to suit their needs. Brings out the creative side in people.
I have no issue with ARF's. they have their place and I own a couple. I did not build them I assembled them. I assemble and fly them but I in no way do I get the same amount of satisfaction from owning and flying an ARF as I get from my kit or plans built planes. Now I will throw the ARF around and fly it like I stole it and will do things I don't dare attempt with nice scale model, they do have their place. The only thing I am risking is $$$ not hundreds of hours of work.
Some high end ARF's require a good bit of skill to complete and to finish. These are well and good but still do not require the skill or effort that a full blown build requires.
Just my .02
Anthony