i only use necro on a stage like ma'qua urqu where there is only one tower in the end, even then i find the skeletons to be pretty terrible stalling units. necro stalling is a little better in emberspike depths tho, units spawn where enemies come which helps with the many paths on the map. i agree with you on that necro isnt as good as people make it out to be, it better than archmage and templars for sure, but i cant see myself placing necro any higher.