Isabelle Huppert is a goddess. How many French actresses have won the Oscar? On top of my head, I only can think of Juliette Binoche and Marion Cotillard. Emmanuelle Riva would have been my first pick when she was up for Amour (also my personal best film of that year), but alas. I know Catherine Deneuve and Isabelle Adjani have been nominated as well. Of the ones I listed, I know Binoche, Cotillard, and Adjani have been nominated for the Oscar more than once.
The goddess of goddesses, Simone Signoret, won for Room at the Top.
I agree that the beginning is slow, but to me, it really built. I thought the acting and cinematography were wonderful. I don't know if it's the best movie of the year, but it was really good enjoyable fluff.

The lyrics were meh but the music itself was enjoyable. Stone and Gosling have great chemistry but if you're doing a musical, your principles need to be able to sing.