Farmville 2 the only recent Zynga success

Very interesting compared to other Zynga games like City Ville 2. I think it is because:

- very professional graphics - not too pushy for money or social - very casual play

The other recent Zynga games seem to be super over optimized for spending. But that does not work as they never get enough traction. Their other games are almost a textbook example of how they were over doing testing/metric and ended up killing themselves.