Some of these might have already been said but here are mine...
- The game feels underdone. Even with all of the current packs and expansions it feels some things are missing. I think it's slowly fixing itself but it's still sad to see a game with such large support levels and fan base get thrown under the bus for the sake of profit. As a fan of the series I'm not saying the game is bad - it just deserves more love and attention put into it.
- I know this one has been said without a doubt, but the control and customization is limited exponentially compared to The Sims 3. When it was released it was probably at The Sims 2 level of customization, and if not, not much higher - and that's depressing to think about.
- I appreciate that it seems recently they've been trying to communicate more with players but they should have been doing that from the beginning.
- No open worlds; in some ways this could have been done successfully, including smaller base worlds with still enough in them to explore but in the end all we got was a road to walk down and a house to live in and that's pretty lame in comparison to what it could have been.
- I don't like the idea of multiplayer in a Sims game. At least, not in a main series Sims game. If it was a side game like The Sims Medieval or The Sims Stories that would be pretty cool, but multiplayer in a base Sims game would probably take away from what The Sims originally was.
