Coming Back
Well I havent left and I dont think it is repetitive. And I think all people here will have the same feeling cause we play the game. Maybe you should try to explain what you where doing and why you felt it was repetitive.
There is high level stuff like legendary weapons that needs you to farm alot. Arenanet is, for reasons I dont understand, trying to destroy these farming methods one by one. This means off course less repetitiveness.
Besides that they are being more active on the living story as before. This temporary content is changing all the time, starting this tuesday a new chapter will start. Cause you missed the last chapter, feel free to read the wiki to fill you in http://wiki.guildwars2.com/wiki/Ceremony_and_Acrimony
(use the table on the top right to go to the followed by story to see them all)
Arise, opressed of Tyria!
It depends on what you like doing and why you felt the game was repetitive, and when you left.
If you only want to do PvP and left a month ago then no, not much has changed. If you like open-world PvE and left before Christmas you’ll probably find it very different.
You can look through the patch notes to find out what’s been added/removed/changed since you left: http://wiki.guildwars2.com/wiki/Game_updates
“Life’s a journey, not a destination.”