"almost every media piece.. to tell the voters..how bad it would be under the PR system proposed."
With PR the devil has always been in the details. I suspect there are several PhDs to be written on the them of what would be a "fair" PR system.
At the very least it should give any MP elected a much cleared mandate. I think it would be great for an MP to know that more than 50% of the active voters (IE those who voted) find them acceptable, even if they were not those voters first choice.