For Sims 4, I was hoping that it would build upon previous iterations. Not stripping things away, taking the game in a new direction, yet slapping a 4 at the end of the title. They had a new vision and I personally don't see how it builds upon what we've had in the past.
That's not me asking for a Sims 3 2.0 - although basic weather in base game would be nice - it's just me asking to build upon the great features that were already there - CASt, Open World, memories, fears and wants, etc not getting rid of them completely.
For example, I think some of the build tools in TS4 are fabulous but the lack of customisation is terrible. I just want to see a successor where 'You Rule' holds true and to me TS4 falls flat.