Absolutely the worst problem, in my opinion, was not even addressed; the abysmal state of programming flight control computers, MCDU's and Garmins. You definitely need a manual and the system bugs are horrendous; for example the late runway assignments by ATC cause the plane to revert back to the previous waypoint. By the time you do a workaround like deleting (if you can figure out to do it) the passed waypoint or deleting the flight plan and selecting a DIRECT TO option so you can select the assigned runway you have progressed a 100 miles down the flight path. I know! Pause while you work around the problem, but geeezzze! Why haven't they worked out this problem by now they have had plenty of time and don't seem to even own up to the problem.
