I'm a huge Barbra freak, but I just don't see her in this role.
As much as I admire Meryl, I don't really see her, either. Too subdued or something. Maybe it's her small eyes, which don't translate to "dramatic silent film star" to me.
Glenn, on the other hand, has the scary intensity, huge eyes, and slightly psychotic edge that seem perfect for Norma.
"Word of advice: Be who you are, wear what you want---just learn how to run real fast." Marc, UGLY BETTY