I saw Glenn Close early in her Los Angeles run, and she was quite solid. Not very impressive singing, but fine acting.
I saw it again closing night. She had descended into high camp and was wringing every last laugh out of the material. It was disgraceful, her mugging. I'm assuming they reigned her in for Broadway. Closing night, Glenn made a curtain speech where she mentioned the death of Jackie Kennedy and the OJ Simpson Bronco chase. She also obliquely referenced the Patti controversy by saying "I'm very proud to be taking this to Broadway" or words to that effect.
I find it very sad that LA doesn't see these kinds of pre-Broadway runs anymore. How fun that was to have that show in town for so long!