Blizzard isnt perfect at all. They know how to make addictive gameplay mechanics. Their priorities are about stable and polished products, and they do not step to revolutionary and risky paths. Blizzard implements into their games mostly verified elements, do not focus on top-notch visuals or on new questionable elements. Thats why their game focuses around gameplay, Id say pretty intuitive gameplay. Breathtaking stories isnt about Blizzard. They have their own approach. They have straight hands and good managers, but they lack of creative persons or willingness to take the risks.