THe main reason why people say AM is better than BG is because, if I remember correctly, AM did pretty well against BG. But BG was 1st or 2nd in the game. Safe 50/50 vortex, 50% corner damage, some of the best zoning, quick movement in a game that has generally slow movement, a full screen teleport that leads into the safe 50/50 vortex...
...and her super looks like it hurts really bad.