Assalamu alaykum
The important thing that we as Muslims do, is to unite together upon the Noble Quran and the authentic hadith, and to adhere to those teachings.
Our starting point should be Tawheed, and to learn and implement this properly in our lives. inshaAllah.
We should not fall into arguing or bickering and throwing labels around.
-- The major problem with today's "Sufism" are the various aspects of Shirk and Kufr, the level of which does indeed vary between various sufi factions, i.e naqshbandi's , berelwis who visit graves and shrines and pray to the dead, the excuse being that they are merely seeking intercession.
Secondly - Any act of worship, that is introduced into the Deen, or deviates from what the Quran and Sunnah teaches should not be done. - this is bidáh which is unfortunately clung tightly upon due to blind following, even though there may be authentic evidence which clearly shows a matter to be wrong.
There is no place for "Bid'ah Hassanah", Good innovation, as the modern day "Sufis" claim.
A Note: In the past, some of the Salaf were said to be "Sufi", and it can be found in various classical books. This meaning of Sufi is very different to what is found today. In the past, it simply meant the person lived a simple life, and they were devoted in their worship. -- They did not share in the major mistakes that are committed today by "Sufis".
Islam is complete, our way of life is all set in the Quran and in the Sunnah, which includes how we worship, being at peace and of course spirituality. We do not need to be Sufis following some tareeqah, or being a mureed to a shaykh in order to be closer to Allah! Astaghfirullah.
People may be confused with sufism, its our job to explain in a nice way what those issues are. inshaAllah. If we are to be speaking about the errors of a scholar, then it must be done in a legitimate and meaningful way.
We should be starting our da'wah with tawheed. This is the key for understanding our Deen. It may be difficult, but, those who are new or are trying with their Deen, might have a lot of mistaken views. We must remember, guidance is from Allah subhana wa ta'ala. We have to learn, and remember, people listen to those who explain in nice, clear, respectful manner. This is how Rasul Allah (s) spoke and dealt with people, even to the most evil of the polytheists.
Mistakes can be built on top of other misconceptions and mistakes. I see many times brothers and sisters wish to explain things to Muslims, but, end up making the situation worse, due to lack of experience and also knowledge. Please give them patience, give them your love and support! If people are sincere they will accept, inshaAllah. Especially with your akhlaq and adaab.
If you wish to help people, sincerely, then, you do not need to compile a list of all the ridiculous things that may be said by them or their scholars. Even if those things are true, believe it or not, this pushes people further away from what you wish to achieve, which is uniting upon the truth. Its not the way of the Quran and the sunnah it is also not the way that the ulema' of the past explained and did da'wah either.
Assalamu alaykum