Atlantafag here. I actually rode that thing the other day. It's basically an express line to one of the worst parts of the city imaginable (The Sweet Auburn Historic District is only as good as the internet pictures will lead you to believe).
I shit you not, there was a tramp at every stop. If a tramp wasn't there, his shitty little pushcart was (I saw one just filled with dolls, it was sitting on the platform with no one around it). I was the only one on the tram, besides a family and their kids out on an Atlanta day trip, so I was absolutely mortified at the thought of one actually getting on. And the simple fact is this...it goes nowhere.
Of course, the city plans to expand the line to much more of the Atlanta area, so that might possibly make it an actually viable transit option- but we all know how quick and efficiently these concepts are carried out in Atlanta...