Liberal blogger Mushroom has posted Six Good Reasons to Support MMP on October 10.
Here's an excerpt:
Under the present system, a party with a majority government has the power to implement most of its agenda, with LESS than 50 per cent of the vote.
Detractors will argue that clear positions taken by political parties will become muddled in the forming of coalition governments. This has proven not to be the case in other political systems in which MMP is the norm.