The transmissions seem to be weak, for one thing. That's not a new problem though... ever since my '98 GMC I've expected to have a transmission job done at around 120-130K miles.
I believe it was just the larger models from the last couple or three years. Especially low milage ones. His mother has an Acadia and it has been trouble free. She says the best vehicle she has ever owned. Dependable, comfortable, and easy on gas.
RSKY