Regarding Charlie, he makes it seem like he does have a colorful personality. That said, his material is most of the times spot-on way before the rest of the industry picks up on rumors of things that have already materialized. Charlie is very knowledgable of the industry and their plans way before everyone else gets a clue. After all, his forums are full of people who work at companies he writes about. Plans change, situations change, markets change, and sometimes his predictions don't pan off, but I see his texts as a great, informed insight into where things are going months or years before any other place writes about it. I see his stuff as "most likely true from where we're looking at now".
In general, that's how I see the SemiAccurate forums as well. There are people with level of knowledge (in PC hardware space) and insight unmatched by any other forums, as many of them actually develop things they are talking about. That's the place I trust the most with predictions, as they are very educated predictions that are more likely to materialize than just your ordinary rumor mill. Sure, they are wrong and they are surprised at times (since many initiatives are successfully kept hush-hush), but less often than anyone else. I surely wouldn't attack their credibility, apart from stating the obvious that their predictions might not turn out to be true due to unexpected things happening or unexpected outcomes of predicted plans. They are surely distinctly different than news sites, even great ones like TomsHardware or Anandtech, who are great at reporting on the released components instead, while SA is just speculating based on their knowledge, but really good knowledge.