It's going the way it often goes when series writers run out of source materiel - they revert back to the 'ol tried and true clichés, with plot armor and poorly patched together stories, inadequately fleshed out or explained - sprinkled with copious amounts of action... when in doubt I guess.
Of course they've managed to keep me entertained for 5 seasons so far, even though 6 is subpar, so I can certainly forgive them that. I just hope they listen to the criticism and get back on track by season 7..