I would like to see more variety of WOW TBC Gold thematic and meaningful quests. They are essentially copied from "go in search of chests of x" or "go kill the x monster and y" or "go to location "x and engage with "y". Some quests require that you go to an ancient ruin and find me some rivets... or go to the edge of a waterfall, to place an easel. They lack any flavor or meaning for the world. (Of course, some do, for instance, the Pastor Walsh quest line. But it seems that they are uncommon.
A greater variety in the types and kinds of enemies I meet could be beneficial. The archers all behave similarly to the dryad archer to the cheap WOW Classic TBC Gold lost archers. They are all duplicated with a new name and so on. There needs to be more distinction between them in order to make the world feel more complete.