I see. From what I understand, since MTA is so large and has such a wide variety of students, your chevra is really based on which shiur you’re in and who you choose to associate with. However much you put in in terms of commitment and putting yourself on the right path, that’s what you’ll get out of it. Because of the wide range, it’s not possible to say that every student or aspect of MTA is a good environment, but it’s easy to only stay in those places that do have a good influence on you. What I’m trying to say is, unlike other yeshivos where maybe the overwhelming student body and therefore feeling of the yeshiva is positive (or chas veshalom negative), in MTA it isn’t set for you, you can find both and you need to make a small effort to seek out the right chevra. I know a BT who went to MTA and it really worked for him.
I know a lot about MTA because many of my friends went there. If you have any other specific questions, please feel free to let me know.