The Warriors are probably going to win in 4 or 5 games, but it's amazing how much of a difference Iguodala's absence has on them. They basically have 6 guys that would get minutes for most good teams (the Hamptons 5 and Livingston). Livingston's injury history makes him a 15-20 minute guy at most.
When Igoudala is out, they have to find a way to distribute those 35 minutes a game to other guys. David West can't guard on the perimeter, so it forces them to try to steal minutes with Looney, McGee, Cook, and Nick Young. As historically good as Durant, Curry, and Klay are (and combined with an elite defender, rebounder, passing big guy in Green), their lack of any depth without Igoudala is keeping games and series close. They were on their way to a 5 game series win with the Rockets until he went out.