For Marie Antoinette, the soundtrack is excellent, lots of post-punk and new wave, so purchase that. Many of the the best scenes are really soundtrack driven so it's a good cd with a film attached. But the editing is terrible - long scenes that could have been done with a placement shot. Like I said, it's so completely ripping off Malick that he ought to take a suit out against her.
Basically, Coppola's films are all about this one theme: poor little Catholic rich girls, stifled by their material wealth but without any kind of imagination to do something else (i.e. it's all about me and what a drag it is to have a dad like Francis Ford).
Plus, if you know anything at all about the actual history, as would the Cannes audience, you'll see that it's a laughable case of dim-witted Americans. The Swedish ambassador Fersen was essentially a spy and was responsible for convincing the Royals to try and escape from France under cover. This failed (partly because Marie insisted on delaying the escape because she HAD to took her hair dresser Fernand with them), and the royals were dragged back to Paris, with the route to the guillotine increasingly harder to avoid now. Anyway, Fersen got his own, later in life an anti-royalist mob in Sweden caught him and killed him by literally jumping up and down on his chest while his military guard watched passively.
