Mysticism I think is kind of a detour from Torah.
Many truths of the Torah are being distorted by a philosophy that places experience and emotions above the Torah. That is mysticism. Unfortunately, the misunderstandings spawned by mysticism have gained respectability within the Jewish community. Because mystics rely on subjective, private, spiritual experiences for guidance and wisdom, they diminish the authority of Torah. Visions and spiritual encounters become more important than the truths found in God's Law. Though mysticism sounds like a cult, far removed from Torah, it has had a profound effect on many Jews who have never heard of it.
Many fallacies prevalent in Judaism today have originated from mysticism.
It is important to identify the possible influence of mysticism in your life. And it will convince yourself of the importance and the sufficiency of God's Law.