I think im the first in my league to figure it out. shhhh.
you're right, i was able to settle in on the NYG defense but still grabbed ww defenses when the NYG matchups werent favorable. most teams that did draft defenses (SD, pats,etc)ended up dropping them for better defenses that werent as highly rated preseason(Bears, NYG,Titans).
i had to play Qb matchups last year (not by choice) and it worked ok as long as you're loaded everywhere else and its not a QB heavy league.