Outgoing Labour Party MP George Hawkins has questioned the merit of MMP during his valedictory speech to Parliament.
Mr Hawkins started his political career in local government, including three terms as the mayor of Papakura, and entered Parliament in 1990.
In his farewell speech on Thursday afternoon, he told the House there is one aspect about the MMP voting system that he dislikes in particular.
"A candidate can stand for election in a constituency, lose the vote, could even finish third or fourth and still be elected to Parliament on the party list."
Mr Hawkins said this type of "each way bet" is unfair to voters.
ACT Party MPs Heather Roy and Sir Roger Douglas, and Labour's Ashraf Choudhary also delivered their valedictories on Thursday.