Not really familiar with Betty's work in films.

She certainly was over the top in this film.
Oh get it? Over-the-top. I made a joke there.

Did you see the Hope and Crosby cameo as the camera panned the crowd? Snuck right past.

Oh I forgot to mention Gloria made a film with Bogart, his best performance, in IN A LONELY PLACE.
Has the same feel as Sunset Blvd.