Toni Collette is so stinking great in this movie

Absolutely. Toni Collette is always a marvelous actress and this is one of her best performances to date. She made Rose Feller such a full, complex, three-dimensional character. I loved that she was by turns warm and bitchy, insecure and strong, whiny and good-hearted. That makes it a really fleshed-out character rather than just a stock stereotype figure. She was robbed of a Best Actress Oscar nomination for her splendid work here, but that's nothing new for Toni.