Backtrackong in maps is horrible.

You go through a big map and then if when find enough yellow mobs you have to backtrack across the map to find and kill the ones you missed. At worst you walk 1-2 minutes with nothing other but walking.
There is even backtracking on boss maps if you miss to many yellow packs.
It kills the the fun out of mapping, maps need to be smaller and a better system for how you finish it.

Not having fun mapping at all atm.