Graham Hancock has never pretended to be a scientist, so what he writes is, by definition, not pseudoscience. "I don't like it" also does not define pseudoscience, as much as some wish otherwise.

Much of it is pure speculation, and rot, but his direct observations -- he actually does go places, and takes copious, excellent photographs (his wife is a pro) -- have proven reliable; much more so than his armchair critics. He is scrupulously careful to distinguish observation from speculation, something many of his critics could learn from.

Ignore both the speculation and the armchair critics, and you may learn, too.