I'll focus on administration rather than anything else.
For us, the big issue that kills the Australian voting system is the vast number of envelopes that we have to deal with at election time without the access for people voting everywhere. If there were a better system for us to deal with that, it would lead to much swifter results, much greater certainty of results, and a better system overall.
I'm focusing purely on the administration of the act rather than a more philosophical approach to elections.