An amazing amount of ideas from Natan the false prophet of Shabatai Tzvi found their way into Orthodox Judaism. Rav Ovadia Joseph was aware of this and tried to protect the Sephardi world from the most pernicious aspects of it. But for the most part people reading mystical Ashenazic books from Orthodox Judaism get enough and too much of it.  The best advice is anything that smacks of mysticism in Ashkenazic books written after Reb Chaim Vital--don't go anywhere near them. [The exceptions to this would be the Gra (Eliyahu from Vilnius and his disciple Reb Chaim) and the Ramchal (Moshe Chaim Lutzato),]
But if you want verification you could check out some of the research into this being done at Hebrew University. I discovered this independently but apparently the professors over there have written a few papers on this subject. I think Joseph Dan, but I forget.
The new book of collected writings of Gershom Sholem has some references to these newer papers in the back.
This is a sensitive problem because there are saints/tzadikim that might borrow unknowingly some motifs, but still be actual tzadikim. It is not an accusation you want to be throwing around when ever something looks a little weird. In fact, the more normal some group seems on the outside, the more suspicious I am. An extra emphasis on rituals make me wonder what are they hiding underneath the facade.
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