Actually Australia's has generally worked pretty well.  Yeah the last election was problematic but that was more due to the closeness rather than system.  Anytime you have a razor thin win you will get this no matter what system you use.  Not much different than the 1972 election which similarly really close here in Canada.  The only reason it took longer is they take a lot longer to count their ballots in Australia.  In fact I believe Canada is one of the fastest to count their ballots which is why usually within an hour of polls closing we know who has won.