I don't think having a brain matters. It's useful against some heroes and garbage against others, it's all about matchup. Most things in DotA are this way, it shouldn't be surprising.
Gyrocopter, for example, will kill Visage ultimate without even targeting in one or two shots. Even level 3 ultimate dies in two hits maximum to a late game Gyro. Against Zeus? Yeah, sure, it'll do some damage.