I understand why Americans (and a whole lot of other countries) don't have compulsory voting. That whole right to believe that all the candidates suck. The non-vote is a vote in a sense. That's what it means in theory, but in reality 3/4 of the population just can't be arsed to stop watching the football game on tv for half an hour and go and vote. Those people have no right to complain about the president they get. Obviously with elections as important as this one in the US, you'd hope a whole lot more get out and vote.
Compuslory elections are good because it gets rid of the laziness, plus it forces everyone to at least spend 10 seconds giving it some serious thought. Like the US, Australia has 2 major parties that have been the only 2 real choices for leadership since forever (one leaning slightly left, one right - both with close relationships to their equivalents in the US and UK), and of course, like the US, many people will still just vote for whoever is 'their' traditional party, not on issues, but still, it makes a lot more people think about their countries politics and leadership, which is a good thing in a day and age where generally most people don't give a shit.
Ok, another question on US elections to be explained for the non US people here - what's this Electoral College business?