When you rate Citizen Kane, it seems as if you need to break it up into sub catagories like the judging on a food show - so much for plating, so much for taste etc. With Kane it's usually so much for raw technical innovations, so much for the applied use of those innovations to tell the story, and so much for the story.
It's hard to still feel the awe of the new things Kane brought because the innovations have been rightfully used and improved upon by countless filmakers since then. I can try to imagine that feeling if I remember the first time I heard the first Van Halen album. That was new and amazing and I still remember the shock I felt. Since then endless hair bands have quickly rendered what was fresh and new into stale and blah.
A real interesting question would be what was the greatest movie before Citizen Kane. What movie did Citizen Kane displace as numero uno. Would you vote for Birth of a Nation which also broke story-telling and technical ground. Would you vote for Gone With The Wind?
Of course my personal greatest movie of all time is Easy Money with Rodney Dangerfield, so that tells you all you need to know about me.