Do all enemies either like aiming for your mid section hate belts or are belts just fairly weak as far as much damage they can take.

My belt seems to degrade at 4x to 5x than my cloak glove helm and other armor pieces.

Can someone explain...

Belts are like all pieces of armor, the weaker materials wear out faster than stronger materials. That's why heavy armor belts are better to reduce repair times, but the ones with better bonuses are usually weaker materials like leather.