Let me stop you right there Jedibanner. Now other than Ghandi I'm not familiar enough with Attemborough's films so I can't comment fully on him.
I love Scorcesse and Chris Nolan is my 2nd favorite director right now, both who I got over Cameron cause of King James's inactivity. Cant be on a pound for pound list without stepping up to the plate in over 10 years. So both those cats are crazy good but I don't they are on Spielberg's level.
The reason is Spielberg can do it all, he's more all around than those guys you mentioned. He can deliver the blockbusters popcorn films the masses love but he can also give you some serious films. He can do drama, comedy, action, adventure, sci fi films, small movies, big movies, it don't matter he does it.
I would guess that Spielberg could deliver a Martin Scorcesse or Chris Nolan type film more than Scorcesse or Nolan could deliver a Spielberg one.









Listen we all know Lucas isnt as good a raw Director as Spielberg..thats a given. Steven wins hands down..but as many has said he hasnt impacted POP Culture and the world of cinema as a whole like Lucas has. Im a HUGE STAR WARS fan/geek, but i can fully admit had someone else directed the prequels..they would have been loved by many more people. I like them for the most part but, as a true fan they will always pale in comparison to the original trilogy. He's a great writer and thinker..just not the best director.