any kind of system where different sized groups could tackle content as they saw fit instead of being lead down a corridor with trash packs then a boss over and over?

how about a dungeon-type area with many different objectives, some that could be done with small groups or even solo for incremental progress, larger encounters for bigger groups, exploration and pathing decisions, etc.

as it is now, you get that one first experience of a new dungeon/primal/raid, but the areas are all completely homogenous and the background is merely pretty decoration. i'd settle for much blander environment with more engaging content within any day.