At this point the only thing to separate you from the masses is the look of your character and how well you can follow directions in regards to what skills to use when. Talent trees, or something of the like and NOT cross-class skills, would allow for different play styles and more freedom within the game. Obviously there is the argument that some talents will be useless and if you want to raid then there is a certain build a character should have but wouldn't it be nice to have an option to tailor or alter skills? A person plays a role playing game, whether you actually role play or not, to play as that character and should be able to play that character as they see fit for what they want to get out of the game. I think talents would add a whole new dynamic that would make the game even better then it already is.