It depends on the IOT, actually, and what the map is meant to do or represent (eg does the scale of the map suits the purpose, does the map only represent political borders or will units be placed on the map or will ownership of the provinces translate to national power, etc). Above all though it should be aesthetically pleasing (obviously this is a very subjective criterion, but I think many would agree with me that the sort of ugly curves in the last map that Nedim posted is not aesthetically pleasing). If it's an Earth map, even if it doesn't represent historical borders, it should at least be based on real world geography (not necessarily real world borders, but certainly terrain, climate, perhaps population distribution or pattern of settlement). Feel free to criticise my maps too if you want.