I still don't know many people that like working with RDF. The ideas are pretty simple, but I feel like they've been poorly conveyed and are hiding behind a veil of ontology terminology. In the Directed Edge webservices API I debated supporting it (and may still add such in the future) but instead went with using a much simpler to read / write self-rolled XML format.

The problem is that RDF adoption assumes that people know how to work with RDF ... or honestly, even get what it really is (which I find often isn't the case).

Another thing that seems to be confused by this article is that "semantic" has two very different meanings in current web technology. In one case it's semantic analysis, in another it's structured data.