As I understand it the goal of this network of sites is to be an awesome no nonsense reference facility.
When reviewing answers with the review tool though I see a large number of answers that I find hard to square with that goal. Typically these answers take the form:
This other guy had the same problem too and he fixed it. Link to X.blogger.com
We use tool Y from company Z. Link to company Z.
They're not counterproductive or directly harmful, in fact they probably do help the person who asked the question solve their problem. They're not spam because it's clearly not unsolicited.
They do however cause some questions to look more like link farms than an awesome Q&A resource. They're often links to transient resources too, which means the answers degrade over time.
At the moment I'm passing over these sorts of answers. Should these answers be getting flagged "low quality" though? My interpretation of low quality was lower than that. Perhaps there should be some other flag? It seems that it's more of a problem with the question itself, but the questions usually are reasonable (i.e. not worthy of a vote close) even if they are at the lower end of the quality spectrum.