Light dying didn't live up to the character? That's funny. I found it, along with most of everyone else, highly appropriate. Ryuk even mentioned in the very beginning of the series that he would be the one to write Light's name in the Death Note when Light ultimately dies. It's called fate. It's called destiny. It's called causality. Light doomed himself the moment he began to think too cocky and too confident in his own ability that he didn't consider any flaws in any of his plans.