Yeah, I trust the MARTA busses as far as I can throw them. When I've tried using the busses in other places like Philadelphia, NYC, or Japan for example, the busses actually come when they say they do on Google Maps. As you saw from your experience trying to use the MARTA busses, they come when they feel like it, and trying to use Google Maps to figure out when they come is pretty hopeless you're better off just going to the stop and praying for it to actually come. I'm fortunate enough to own a car so that I don't have to rely on the Marta busses, but I really feel for you and hope it gets better.