I like Ruhe. He's not exactly a scholar, though he is certainly very erudite, and has been deeply affected by scholarship. And yes, he repeatedly and clearly expresses his conviction that Theravada represents the true teaching of the Buddha, of which Mahayana is a distortion (though he does concede that it is not entirely unrelated to the Buddha's teaching). He came to this conclusion, not unreasonably, after learning that scholars more or less agree in rejecting the Mahayana sutras (though it is possible to doubt the Pali canon as well). Anyway I find his honesty, and sense of humor, about this refreshing. He obviously loves Buddhism, and loves teaching the dharma.
His belief in the Loch Ness Monster (it's a naga), Bigfoot (it's a yaka), and UFO's (they're devas) is difficult to disentangle from traditional Buddhist folk belief. In other words, he's not THAT crazy, especially considering that his mother was a trance-channeler. Some of the conspiracy-theory topics mentioned above were actually topics due to be discussed at another group that he attends, and may not represent his personal views.
Read his autobiography! http://www.theravada.ca/biography/