AI

Many maps on the Champion difficulty are simply unplayable; RPG-style gameplay is definitely not possible because you won't be able to develop due to strong neutral creatures, and the computer might not develop either. I once had a situation where the AI just sat in its town and was afraid to leave because of hundreds of creeps. You need to find a balance, and perhaps the Master difficulty would be better; then the creeps will be moderately strong, and you'll get a similar amount of resources.