I'm not familiar with the Matthews bows. But I do know that today's bows are much faster than those 20, 10, or even 5 years ago. Before, most hunters used a 70# bow to generate enough speed with, lets say a 450 gr arrow for relatively flat trajectory which in turn would generate enough kenetic energy to harvest deer and elk or other game. With today's bows you can shoot lighter arrows much faster with more flatter trajectory with less draw weight giving you a similar kenetic energy with less strain on you. I used to always shoot bows in the 70 to 80# range. But today my heaviest DW is 63#. My favorite bow is a Martin Cheetah with the DW set at 51#. Shooting a 326 gr arrow, this bow is plenty fast enough for whitetail and is deadly silent and accurate.
Now there is a fine line between speed/energy/penetration. Depending on the game you are hunting you may still need a heavier arrow to 'drive thru' it. A moose for example.