For sure you are right about the human factor.
However, maybe the fact you never hear about a failed system is because of the two smiling pilots in the cockpit being able to control and decide.
Also, don't forget about weather conditions, aircraft type and onboard systems. Sure, you can automatize as much as possible, but weather will still be unpredictable. And the weather radar also doesn't always shows you the truth.
Then, the more computers you put in there, the more computers can fail. And if you're the lucky one to have, for example, and electrical fire, or a short circuit.. then who takes over controls, or decides what to do? Who's there to think outside the box?
I would say there are many things a computer can do "much better", however at a cost (pilot's concentration, skills) and to a certain limit (environment, corsschecking, outside the box thinking, etc).
So in the end, I surely hope (and don't expect) massive public transportation in pilotless aircraft.
Cheers,-