When Wayne flew the 767 - he did great. Honestly. But I took care of a myriad of details.
The devil is in the details.
You start with what you know. I knew enough to face forward in the seat and put my seat-belt (harness) on. But even that was a challenge. I fiddled with the harnes for a while and had to ask how it worked. Then I had to get the seat forward. The seat is unlike anything I've ever seen, pretty cool actually, but you have to know how to operate it as it's complex, I didn't. Again, I had to ask how to get the seat forward. Then fun then begins. Where do you start? I know how to fly and know the operation and function of the instrument cluster, but the 767 doesn't have an 'instrument cluster' like I'm used to, it's way cooler than that, but I had to ask over and over, where is this, where it that. I figured out where the radios are, but the controls are way different than anything I've used. Probably the funniest "where is?" was when I needed elevator trim and asked, "Where is the elevator trim?". My left thumb was touching it, but I didn't know. It sure was easier to fly when properly trimmed.
Let's land. How do we set up the ILS, where are the localizer and glide slope indicators, how do I tell if the ILS is flagged or good, what is the max gear extension speed, when to extend flaps, when to arm the spoilers, how do you arm the spoilers, how many degrees of flaps for landing, where are the flaps, what speeds in many different configurations, how to I turn the instrument lights up and the cabin lights down, what speed for approach, how much power for approach, how to decouple the autopilot, how to turn the autopilot on (super complex to set it up to do what you want), where are the auto brakes, how do you arm the auto brakes, where is the gear handle, how do I know I have three in the green, when do the engines go to idle, when do I start to pitch up on landing, how to use the thrust reversers, what is my max turn-off speed, how to turn the auto brakes off, where are the manual brakes, how do I steer. That's just landing and that's only the tip of the iceberg. I knew what to ask and had the answer man sitting beside me.
Then you actually have to fly the airplane, forget about the autopilot, none of the surveyed people could use it, because it's too complex. Deploy the flaps and get a major pitch up (my estimation is that this would cause most of the people surveyed to stall and crash). I also think that nobody would be able to get the airplane slowed down, because it takes too much coordination with throttles, speed brakes, flaps, and gear. If you are too fast and you have to do a go-around, it's game over. The surveyed group would never be able to handle the airplane at full thrust, full flaps, and gear down, then try to coordinate cleaning the airplane up. Just the concept of coordinating pitch and power would likely doom others. They don't know flying airplanes.
I landed the airplane 5 times without any 'help', meaning his hands off the controls. I have thousands of landings and understand the premise of how to land an airplane. My co-pilot generously gave me no crosswind, no turbulence, severely clear skys, no ATC, and even made it daytime, how nice of him! Oh and he also talked me though landing the first time as I landed. I wouldn't have know when you pitch up to arrest the descent rate or to hold the nose off, else slam it into the runway and it will SLAM it into the runway if you let it. He also deployed the thrust reversers, because I was a bit busy being overwhelmed keeping the airplane in the center of the runway, because the whole airplane was unfamiliar to me.
The 767 flies just like an airplane, but the complexity is remarkable. I have about 1,500 hours mostly instructing (instructing will teach you a heck of a lot about flying) and still found the airplane to be a complete handful, because I wasn't familiar with it.
If I opened the cockpit door to two dead pilots and the only option to live was to get the airplane on the ground. You can bet I would try, but it would be very difficult to land safely. If I could get an answer man on the radio to walk me though controls and procedures, then I might stand a chance. The first thing I would do would be to tune 121.5 and declare an emergency, then tell them I need a company pilot to talk to that flies that airplane, figure out how much fuel we have, then get vectors to an airport with clear skys and huge runways and hope my bag of luck is full.