I have not played an MMOG since Lineage 2, which I enjoyed except for the blatant cheating and bot farming.
From what I have read NCsoft is apparently attempting to make Aion more accessible to casual players (i.e. less grind) which is a good thing.
I may give this one a try, there is some good information here
regarding the game.
For those who don't think the game looks good, watch some of the movies, some of the environments are amazing.