Yes and no, I'd rather see her death in ROTS rather than have her live beyond episode III and wonder how or why she died.
Lucas was kind of in a no win, because we all knew from the OT, she died somehow and the best possible senario for her death was probably at the hands of Anakin after he turned to the darkside. It's kind of hard to believe by itself she died because she was force choked, but if you add in the fact, Anakin who she loved was lost to the darkside, the Republic was no more and the Jedi had been hunted down and all but killed...it was written as symbolic as her no longer wanting to live. (I'm sure there's mythology reference in there some where.)
By the same token I almost wish Han Solo had died in sacrifice at the end of ROTJ (another redemption symbol), like Harrison and Kasdan had strongly suggested...As much as the like the scene with Leia revealing Luke was her brother at the end...I think It would have added more depth.