Don't be too quick to judge.
Just curious, what would you do in your car if suddenly you stepped on the brakes, and you got normal resistance, the brake pedal stopped at the normal place, but the car didn't decelerate? How many times would you pump the brakes, expecting something normal to happen? After a few seconds, you might reach for the parking brake.
These guys moved the TLs, they moved, and nothing happened. The normal descent rate for that airplane on an approach at that altitude would be about 700'/minute. So, I'm guessing that as the speed deteriorated, they tried some standard emergency procedures like selecting flight start on the ignition, quickly trying to analyze why the engines were not producing power, disconnected the auto throttles and attempted to apply power. The fact is that none of us train for this-unresponsive throttles at 500.
They would have had "bitchin betty" screaming in their ears, probably some other aural warnings, and I wonder if the passengers or FAs could have even heard a "Brace for impact" call over the din in the cockpit.
I'm guessing that at the point that they knew that they were going in, they had about 15 seconds, and they spent that time SAVING LIVES by keeping the greasy side down, the nose up, the wings level, and the descent as under control as they possibly could have. Without some warning, a "BRACE FOR IMPACT" call over the PA would have had everyone with their heads up saying "What was that???"
The plain simple fact is that both engines failed to accelerate, and everyone lived. I'd call that a successful landing, at least from the crew's standpoint.
Of course as someone said, aviate, navigate, communicate.
As someone else said, let the experts do their jobs. If the crew did anything wrong, there will be plenty of time vilify later.