Just a quick google search led me to blogsites criticizing these other Guru movements. For some reason, I can't post the multitude of sites that just popped up. Just look up "skeptic" and any of the following Gurus: Amma, Maharishi Mahesh Yogi, Sai Baba, Parahansa Yogananda, Brahmakumaris, Swami Muktananda, Buddha. The list could continue, of course, but those were the Guru movements off the top of my head.