[Unpopular Opinion] What makes Morrowind worth being the "first expansion" with a $40 price tag?

With days of game time, multiple max level toons, and hundreds of CP under my belt, I drifted away from ESO a few months ago. My friend and I both said we would come back to play in Morrowind, because there would surely be a ton of content for $40. Well, I finally started playing it and am very confused as to what makes Morrowind any different from say, Orsinium or Thieves Guild? They both give a new zone, a number of delves, and public dungeons along with a heap of new quests. Sure, Morrowind added a new class (seemingly the weakest class), battlegrounds (horribly imbalanced, no matchmaking or level brackets), and a fan favorite zone, but how is this any different from the multiple other expansions that offered similar gameplay? I don't want to seem "whiny," but I'm feeling rather disappointed that there is not a single new dungeon and the only group content is the nearly unplayable battlegrounds or the trial for highly geared, highly invested players. What do you guys think? Did you get your money's worth? Do you think there is a distinct reason Morrowind wasn't released like all the other addons?