* It is very complicated compared to first past the post.
* It is very complicated compared to first past the post.
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* It produces a higher level of informal votes especially with Australia's compulsory voting.
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* It produces a higher level of informal votes especially with Australia's compulsory voting. In the Australian system of preferential voting, if each candidate is not numbered, or a number is skipped, the ballot can be thrown out. With some electorates having twenty candidates running, voters can easily make mistakes and have their vote excluded.
* The two-party system can be a detriment to minor parties and independents who want to hold office.
* The two-party system can be a detriment to minor parties and independents who want to hold office.