I have to agree with those who found Paige extraordinary. Rather than parody Swanson, she channeled her, IMO. She opted to use what worked in Swanson line readings, and why not? She looked eerily like her. No, the set did not swallow her. And her size became part of the character.
I saw Buckley twice, and though she was startling good in key moments -- "As If we Never..." prominent -- she also played Norma as a victim, and found zero humor. There was no fun with Joe, just her neediness, which was played to the hilt. You thought she would swallow him whole at the end of act one, as opposed to Close, who found something vivid and almost violent when she threw her talons on him.
I saw Close in LA and again on Broadway, and her performance was remarkable in both venues, though I think she actually seemed to sing it better in LA. I think she had trouble negotiating the head notes, and at times you can hear her approximate their weight. But who cared? You couldn't take your eyes off of her, and the music was still there, the melodies thinner but haunting -- truly character singing, not a diva letting loose with the money notes.
"I'm a comedian, but in my spare time, things bother me." Garry Shandling