There is a custom map that uses similar concepts in Warcraft 3 called 'Warlocks'. The projectiles move slow enough that they are easily dodgeable, but the arena is small enough that you still must use precise movements.
I will give my opinion from the perspective of a long-time DotA player... 1. How do you see General-style and Assassin-style Demigods match up in just fights involving the two of them; no other units involved? Summoners vs. Hero killers fights always depends on positioning. When a summoner hero is by his tower, using his summons to properly block the chasing hero killer would result in an easy win. If caught in the middle of an open area, a hero killer would probably prevail. If