Don't forget that abilities that give extra attacks are more likely to allow you to use Hunter's Quarry since only one of the attacks has to hit to activate it. Plus if any of the attacks crit then you can add the Quarry to that one and max it out (based on the wording of Hunter's Quarry that you decide after the attack roll which attack you wish to add it to). That coupled with the bonuses Larrin mentioned, tend to make multiple attacks a more compelling choice for Rangers than single big attacks.