I tend to evaluate sites over time. Some authors I learn to trust, others I use to provoke thought.

In general I look for articles that give examples. In effect they document the experiment and the results therefore both are up for peer review.

An article may give a good write-up of results but without the experiment you have no idea of the circumstances that gave the result.

There are one or two MVP blogs that are really good but not all MVPs are created equally. Some MVPs seem to have gained their status through general competence but mainly wide ranging services to the M$ community. Others seem to have gained it through a more specialised focus. Both have their value, it just depends on what you want to achieve.

I sometimes find value in less experienced DBAs asking questions. You can learn as much from a good question as you will from a good answer.