One thing that bugs me: if i have two sims going to the fridge, one of them will ALWAYS cancel their action if they get within a room of the fridge and the other sim is still around it. It doesn't matter if the other sim is almost done, or already leaving. This is really frustrating in larger families where multiple sims need to eat at once, to the point where i've started purchasing two fridges for larger households.
Also, if a bathroom is connected to multiple rooms, sims will use it like a hallway, even if it's already occupied. Yay needless embarrassment moodlets!