Maryann Freepartner - Coalition governments tend to ignore the desires of the people who elected the coalition's individual members. The constituents voted for certain things the candidates addressed during the campaign. Now they won't be getting those things, or even a nod at those things, because their candidate has chosen to represent the priorities of the other party. Coalition government is disenfranchisement of a sizable plurality of the electorate, who voted for one thing only to discover they will not be represented at all.

There are worse things than not getting things done in a legislature. Failing to represent those who voted for you is much much worse.