The impromptu game of musical chairs when they are talking at a table...
JUST SIT DOWN.
Why do they like to stand in-front of the stove or barbecue and turn it on while speaking with someone?
The books being left on the kitchen counter all the time is making me crazy. I even moved the bookshelf closer so they wouldn't have to wander around the lot, a pity it didn't change anything. They'll read the book upstairs, walk downstairs to the kitchen and set the book on the counter, then wander over to the book shelf to grab another book and go back upstairs.
I'm on my way to generation 3 in my game, so i've had a couple deaths, but they won't stop crying at the stone. It's driving me mad. I have put all graves in the inventory for now, so my Sims will do something else, or finish the task I tell them to do instead of standing there sobbing for an hour.
I miss assigned beds, and being able to lock doors, and I don't like how often the appliances break. The maid service is very unreliable as well, they'll show up faithfully until I turn my game off. When I return to the family, I have to fire the maid and re-hire them because they aren't showing up. It's not ruining the game for me, just a minor annoyance.
The story progression/aging is irritating me as well. In my family I had a pair of twins born to my founder. I chose to send the brother out into the world to see where his life goes...and he died of old age. His sister just had her adult birthday.