If I might chime in here....
ATA is global friendly. The last numbers that I heard indicate that we have well over 2000 schools world-wide.
As far as the negative remarks about ATA go, please keep in mind that the vast majority of them originate from people who know very little about the ATA, or from people who washed out of the ATA. Now, having said that....yes, ATA has some warts, and some of the complaints are justified. Any large organization of people will always have some folks who wind up under the left end of the bell curve. Unfortunately, they tend to be the ones who get publicity and then everyone thinks they represent the organization as a whole. You may be hearing from someone who had a bad experience in *one* ATA school. That school is not indicative of the organization as a whole.
Some people are not happy with some ATA schools that have adopted business models that tend to rub people the wrong way. But amazingly enough, those same business models are in use in other organizations as well. There is the business aspect of running the school, and then there is the teaching aspect of keeping the quality of instruction high within the school.
Bottom line is this...if you are happy with the level of instruction in your local ATA school, then stay there. If you're not, talk to the instructor(s) and express your issues. If you don't get a reasonable answer, then vote with your feet and go down the road to another school. Visit that school, watch classes, talk with the students and instructors. If you like what you see, then make the move.
I've been with ATA for a long time - 2014 will be my 27th year. I have disagreed with some of the things they have done, and some of those things have fallen by the wayside. In the long run, however, ATA is continually trying to find ways to make martial arts training easier to get and more accessible to the general public, and to improve the quality of instruction that we offer. Sometimes, the only way to do that is by trial and error, and we occasionally stub our toes. But the vast majority of ATA instructors, I think, are oriented toward one goal, and that should be the goal of any instructor in any discipline whatsoever: we all want to turn out students that are better than we are.
If you would like to continue this discussion off-line, feel free to PM me. I'll be happy to answer any questions for you that I can.