The elite mob for the week (at least on Sarg) was a B rank and easily kill-able by 1 person. You can still get full reward for any rank no problem by jumping into a party, just shout for an invite as you're running or once you get there; most everyone is eager to add more people to their party because they know that's how you get the full reward. Just drop after the mark is dead or stay if you feel like hunting more. *shrugs* Not difficult. It's hardly surprising that this community based game added features that require people work together to take down a strong enemy and reward you based on how much you cooperated with others.

And this single feature is hardly the signifier of all endgame content to come; did you even bother to consider the other great things they added this patch or last? Don't like this one thing, don't participate in it. I haven't even touched Frontlines and I'm no worse for wear.