Considering that Anandtech was the first guy to objectively measure iPhone 4 antennagate signal loss, the first to write about retina screen burn-in issues, and reported that the first retina iPad 3 actually decreased in battery life, I think you have little to worry about with Anandtech. He's never been shy of Apple criticism, or praise. That is why they value his opinion. If they thought he was a spineless yes-man, they'd have never hired him.
Even if he was biased, you could throw out his opinion and editorial. The objective tests aren't subject to bias and can be repeated by anyone. That's the whole purpose of the testing, to remove personal opinion.