Sometimes, in any fantasy world where you have invested a large amount of your imagination, you start to append your real-world experiences to those of the characters being portrayed. For example, in the Star Wars universe, characters such as Luke are relatable, in that most people understand the story of “the everyman.” He is compelling because of the extraordinary destiny that lies ahead in his life.
Though the game is made up of classes- which are intrinsic to the design of the system- you can try something new with your next campaign by getting rid of them altogether. Some sub-systems in 4th Edition will have to stay, such as those for purposes of multi-classing and the feats and powers associated with them. But for the most part, you can choose to just simply get rid of all classes.
The original classes of Dungeons & Dragons, their foundation of the current classes, and the current state of the edition wars.
Be a team player! Make characters that are fluid enough to work with others at the table.