Mistakes that shouldn't been repeated in The Sims Series

Fix bugs. Let me say that again: fix bugs. Don't keep putting out more bug-ridden fluff hoping players will forget about the old bugs.

More options. Want to include multiplayer? Fine, but make it optional. Don't make the graphics look like cheap 1990s garbage; instead, have scale-able graphics so that someone playing on a potato with wires can have low-res and that someone with a newer gaming rig can have cutting edge graphics.