Personally it's the immaturity of even elders in the game that really annoys me the most. The ridiculous 5 year old potty humour etc.
Not all simmers are kiddies EA. As another simmer mentioned in an earlier reply, I am an elder simmer, a senior citizen and the childishness of this game can make me want to throw my PC out the window some days.
BUT, it's the careless bug riddled updates that really get me hot under the collar.
I am a deep closed test team member for some very high end simulation manufacturers and Sims is NOT a sim.
I build training simulators for emergency response training and natural disaster training.
I can tell when coders are being lazy and slack. EA is full of them now sadly.
I truly believe the only thing that will save our fun will be a massive class action law suite to drag EA\Maxis into line with modern consumer rights thinking.
EA, respect your customers because WE are you only pay packet. It really is that simple.