Craig is a former ambassador to Uzbekistan, who served in the Foreign Office for many years. He's since dedicated a lot of his time to following and reporting on the Assange case in the UK.

He doesn't hide his opinions, some of which are quite strongly worded, but I don't think that makes him less worthwhile as an observer. I'd say he is less of a fact-finder/whistleblower and more of an analyser/commenter.

I personally find his articles insightful and nuanced.