It wasn't the performance that was bad, yank, it was the REASON she died that everyone hates. Why would she lose the will to live with two babies to raise? They should have either said:

1) She died of complications from child birth or from Anakin's Force Choke

2) The damage Anakin was done was terminal, but she lived on with the Organa's on Alderaan for a few years (long enough for Leia to remember)

Thematically it works better that she died, but for continuity's sake I would have preferred if she didn't.