Route selection is based upon many things and unlikely to be optimal in all cases. Routing will tend to favor the major streets and avoid side roads. Also, routing information for streets in your area may be incomplete or inaccurate. The Entune navigation will almost always get you to your destination and that's the ultimate goal. It will likely never be as efficient as navigation systems that use crowd sourcing and those that remember your driving habits to refine routing.
Yes, you can set areas to avoid but the settings are really designed for temporary situations, e.g. construction, detours, etc. Avoiding certain roads, especially major roads, would probably cause other problems in future routes.
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