I'll tell you why so serious

The film never slows down or bores, plunging from one harrowing sequence to the next.

It is a whirlwind of delight --- attractive actors, stunning couture, spectacular sets and outrageous parties.

what a terribly boring film. I'm sorry but this is absolutely not deserving of best picture and will be forgotten quickly. Entertaining and engaging cinema? No. Nothing performances with flat faces and mistaking silence for subtlety.