Personally I think the preferential voting system we have in Aus is brilliant.It's a shame the way the system works. I don't think we will ever see a third party get majority. The preference system is pretty awkward.
The major party you had higher on your list of preferences counts as a vote for them.
Even if I had Labor second last and liberal last I'm still technically voting for Labor to be in power.
If someone can think of a better voting system I would love to hear it.