The verses that you read is not complete, and there should be a context on it, what kind of poem that are written by them (that Quran verses mentioned). As I remember at that Quran verses (correct me if I am wrong, it is just my memory) Allah said about someone that act conversely with the way they say (the way most of poem reader behavior in Mekah at that time). We should also understand that at that time poem readers are the ones of the prophet competitor in getting Mekkah resident heart. They got spiritual pleasure from poem reader.
As we all know, Quran is also using poem kind of words, this kind of words is there to affect the heart. I believe we will be like robotic kind of people if we read Quran verses that is written like university text book. So, why should Sufi get blamed if Quran itself using that kind of style ? So, by this, you can see some kind of different personality by seeing the way Ibnu Tayimah /Ibnu Qayim write their books (Salafi people) compare to almost all Sufi literature. I can tell you that, Sufi literature are not boring, and exacting. Do you know that Imam Safei also write many poems and compile it in one famous book?
Talking about Sufism book, I will give my recommendation on this Thread. But as a good Muslim, I think we all understand that we should not follow any teaching that hasn't had any proper backing from Quran and Hadist. I never become a fanatics of any Sufi, even, sometimes, I dont like the way some Sufi talk in their book that I see as exaggerating something (not talking in proper proportion based on Quran and Hadist)
