The many abysmal flaws have been discussed to death, but let's try to salvage some small kernels of good memories out of this expac, eh?
I liked that Shadowlands was set in a sky dimension of floating islands. You could see strands of anima floating up into the sky. Gorgeous skyboxes The hyperspace flightpaths were cool.
Having 4 brand new factions that the player could join (Covenants) was a neat concept, even if they weren't very unique and were underdeveloped.