You don't even need to win more then 50% of your matches to qualify for the playoffs. The last two years, team number eight had more losses than wins.
Just to be clear, two years ago Hull were 8th and had the same number of loses as wins. While last year Wakefield qualified with more losses it was only because of Bradford's points deduction, and they had more wins than loses.
Of course, even under the old top-6 system Salford and Warrington in 2006 qualified in 5th and 6th, both with two more loses than wins.