Yeah but that's exactly what GFE picked her on Towers for. Tempo had Zeratul and Greyman, AAs are a huge amount of their damage output and Fan made some decent plays. The Uther pick sucked.
She's bad vs zera and greymane though. Sure they have good aa damage but neither of those heroes are really AA heroes and they both out range and out play a cassia.
Like even though greymane autos a lot, that's still not what's scary about him if you're a ranged assassin.