For me, Charlie is a fun novelty, and I often find his posts rather amusing. I don't care about his bias or "hate" simply because I'm an individual well capable of thinking and drawing conclusions so I treat his way of criticizing nVidia ("Dear Leader", "habitual values", etc.) as a flavor that makes reading quite fun sometimes, although it's not always appropriate and often exaggerated.
As for credibility, well, he's semi-accurate, and the site name fits. I take everything he writes with a grain of salt since he's been wrong quite a few times. However, his Fermi info, while exaggerated, proves that he IS indeed well informed and certainly has an inside source @ nV.
No question that I'm going to continue reading his "nonsesne" - it's often at least partially correct, and it's fun, too, even if his style is slowly getting old.
BTW, I'm not a red or green soldier in this "war". I always buy the card that at the moment seems to offer me the best mixture of performance and features. Despite all the criticism, also from Charlie, it happens to be the (in)famous GTX 480 now. If there are two comparable cards from ATi and nVidia in terms of performance, I'll probably choose the "green goblin", simply because I still believe there are fewer driver issues with GeForce cards, and I'm a bit reluctant to give up PhysX/CUDA. I couldn't care less about 3DVision and Eyefinity though.