MKX has it right- give everyone zoning or anti zoning (like a harpoon/reflect/teleport) and give everyone rushdown. The issues come when characters are OP in more than one aspect, Kabal rushdown wouldnt be so bad if he didnt have instant air balls, Zod zoning wouldnt be so bad if he didnt have a normal parry and amazing normals, Batgirl wouldve been fine if she earned her way in instead of having anti zoning plus amazing rushdown. Give every character either one strength or be medium at everything (generalist) not MMH where he outzones, out rushdowns, out anti zones, out grapples everyone
If I only wanted rushdown id play DOA, if I only wanted projectiles id play call of duty, I want everything balanced, no character so strong at long distance that all they do is run and spam unless they are completely useless up close to even it out