Most of the attacks on MM are steeming from ignorance of the system.
Things like "Mystery says to use other people's lines word for word, and to never think of anything original". Actually, in VAH Mystery says explicitly NOT to do this. He recommends creating your own original material, because in the long run that works better. He simply states that being able to deliver other people's material *can be* a useful skill. The entire VAH is mostly about creating your own stories, routines from real life, build an identity, etc. He also states several times that one needs good social skills and natural conversation ability. I don't know how Mystery could have made this any more clear, the people saying this are just completely ignorant of Mystery Method.
If someone doesn't like Mystery Method that's fine. Men have been getting laid for thousands of years without it! OTOH, I would be careful of some of the so called 'gurus' who have financial gain to slam MM. One that comes to mind I recently heard slam MM, when asked what he would talk about with women the only thing he could think of to say was "make fun of all the other guys". Each time the interviewer would ask this q from a different angle, that's all the guy could think of to say. Wow, one thread to talk about! I bet she will think "that's the most interesting guy I've ever met, he makes fun of people for hours!". I think it's wise to avoid anyone overtly negative, with all the egos and money in the PUA community, all the 40 year old virgins are going to start offering workshops to support their hooker habits LOL
There are also a lot of men who are very jealous and bitter. The average man (according to the polls I've seen) sleeps with less than 10 women. LESS THAN 10 WOMEN!!!!!! Can you believe that???? Now, I'm not shy to let people know I've slept with more than 50, and most of those were actually attractive to really hot (yes, I did do a few UGs, but for other reasons like they had one really good attribute --nice ass but poor face, pretty face but stretch marks, etc). So yea, the guy who onlyslept with 10 women, even if all 10 were picture perfect, is probably going to wither admire or hate a guy who has Mystery's level of success. That's totally understanable.