a) excellent depiction of the geography of the theater. the use of port boxes, islands, and areas (each with its own basing and combat restrictions) does much to add depth to the geographic considerations a player must evaluate.
b) great (and realistic) use of fog of war. Rick Young has commented that one of his gripes with Pacific Victory is that there is too much FOW. (i.e. you should be able to at least tell an air unit from a naval unit). He's right (although Pac Victory is still a great game). AE strikes just the right balance in the FOW department.
c) Excellent depiction of the impact of American submarine power.
d) the game is (as another commentator here has noted) "process heavy". There is a very detailed sequence which must be followed. Fortunately, the game comes with some outstanding player aids, including a Player Turn sequence chart. The process is mildly intricate, but once you've done it a few times, it becomes second nature.
e) The game is (to my thinking, at least) more complicated than EE. However, this is not surprising given that the Pacific is a much more complicated theater to depict. The mix of land, naval, and air units added to the various geographic considerations almost mandates that the game will be more complicated than one covering Europe.
Overall, a very interesting game and one which requires the ability to think through many different considerations -- each of which has an effect on the others.