Standing Ovations at curtain call don't mean a damn thing. It's when people stand after a particular song or moment (I believe way back when those were known as "show-stoppers") that is an indication of how well perceived the show and/or performer is. Like when Bernadette Peters gets standing ovations after Rose's Turn. She doesn't get them every night, so when she does it means that she was really on target that time.
Sometimes when I see a show, I stand during a curtain call just so I can friggin see over the person who stood up in front of me; not because I thought the cast deserved it.
When people come out during curtain call, I stand for whoever I think deserves it; and I will not stand until that person or persons comes out. They deserve to know that the ovation was for them and their performance, and not just because it's the common thing to do.
"It's the little things; the details, that distinguish the Barbra Streisands from the Rosalyn Kinds."~Gilmore Girls~