Yes you must be carefull of cults, especially the big ones, in particular the cult of personality that sorrounds them travelling about from place to place wearing the robes as a humble buddhist smileing a peaceful smile, but also wearing a double face appearences are deceptive, Blind faith is a tool they use, complete obedience to the master nothing this one does can be wrong, a facade as a great leader true it may seem but the divinity attributed to such a one may be just a hollow shell as their personal actions tell all.
To uncover the reality behind them one must observe the objects that a spiritual guide should possess and examine their actions extremly carefully to see if they accord with the buddhism they are ment to be following.....No matter how famous they may be, no matter what high esteem they may hold investigation must be taken to see if they are correct nature for being a guide along the path, are they humble, free from worldly attachments, keep an eye to see if they travell in style, Investigate has this person caused others harm by their own personal actions.......
The cult of personality is very much alive and well.....
I read a very interesting peice of work " stripping the gurus"
have a read im sure you will find it very interesting.http://www.scribd.com/doc/6996781/Strip ... ightenment