As a bit of a Chargers homer it's been more the coaching and supporting cast. I've seen games where through three quarters Rivers and the offense have been doing well, defense ok and then in the fourth quarter the play calling rapidly changes, no first downs, and the defense makes stupid penalties/plays and can't get off the field.
Last Sunday's "perfect snap right through the hands" surely wasn't Rivers fault.
But yeah, when the Broncos scored with over 8 minutes left to make it two TDs to win, our whole group thought, "What creative way are they gonna lose a three touchdown lead in half a quarter?"