MO Paris started off quite well, but the decor by Sybille de Margerie started showing its age very, very quickly and even the suites are now looking scuffed and tired. Also, I felt that food had deteriorated and, generally, the hotel felt passed its sell-by date.
There is talk of them re-doing the Lobby, as its configuration does not work very well.
The only really good thing about MO Paris is the Bar, which is excellent, and the garden courtyard which is great in the summer. Otherwise, FS George V walks all over it, in every respect.