Even in the US where the preaching work has been going on longest and most widespread, very few people have any idea what the message of the Watchtower Society or Jehovah's Witnesses is. Why? Their methodology is flawed. Selling books and magazines that are rarely read sporadically to people doesn't deliver this message. My parents have been in the preaching work for 60 years and have not gained one convert outside of their relatives and they are both quite intelligent and good communicators.
Less people know what Jehovah's Witnesses believe now than did 50 years ago. The peak of penetration was probably in the 50's and 60's and has been drifting lower ever since.