Summerset is the best expansion, with Elsweyr coming in second imo.
Summerset was a fantastic end to a great storyline, The zone is beautiful, The quests are memorable (Like the one where everyone is acting like an animal) Jewellery crafting, one of the best trials imo. Elsweyr is beautiful too and the new class really was a great bonus, I love the zone.. The story let me down a little, I found myself a little disinterested in it, I don't remember many of the side quests either, only really the one with Raz.
The Summerset Chapter was Elder Scrolls Online at its zenith for me. The Daedric War arc spanning two chapter had finally concluded in a pretty satisfying way (if we ignore the horrible design direction they took with Nocturnal in the Crystal Tower fight). We also had the chance to visit Artaeum for the first time ever and not only interact with the Psijic Order, but also join them. Everything ZOS built in the previous years tied beautifully in Summerset. And in the second half of that year we got to explore Murkmire, a stand-alone region, which felt quite refreshing.
After that, we started this tiresome tradition of "Year of X" and every single zone and story got funneled into the general theme of Dragons / Vampires / Mehrunes Dagon. Don't get me wrong, I like continuity, but getting a whole year of the same thing is not that fun by now. I would rather have a story spanning several zones/chapters, like Morrowind-CWC-Summerset and with other stuff sprinkled in-between.
Elsweyr was interesting but the quality of the story dropped a bit and I can't say exactly why. The Year of the Dragon was fine as an idea, exploring Dragons in a completely different setting than Skyrim was interesting on its own and the legends of old were also pretty creative. I just with the whole Euraxia Tharn and the liberation of Rimmen was a bigger plot point, I feel like it resolved fairly quickly.
Now onto Greymoor, I feel like the quality of the stories dropped significantly and I really liked Lord Ravenwatch's storyline in Rivenspire. The political machinations that ZOS teased were not that deep and yet again we have a young princess' coming-of-age story. Western Skyrim was also not a very interesting region to explore, I feel like - other than some new regions of Blackreach - there was nothing really new or exciting. The Markarth DLC was more interesting than the actual chapter.
Blackwood will probably continue in the same style as Elsweyr and Greymoor but at least unlike last year we have a relatively new area to explore. We'll see how groundbreaking the story really is, though. I'm hoping for something that would change the current status quo in the Three Banners War, but I doubt we'll get that.
Loved the lore expansion for khajiit. Also dragons, in my homeland. Making me hope that my family is safe.
That one khajiit obsessed with werewolf behemoth and vampire lord. Lady Thorn is bae, dont @ me.
Werewolf behemoth=vampire lord>blood scion>werewolf>vampire.
Morrowind (other than that insufferable wannabeTelevanni argonian) is my pick. Summerset is fine but I personally did not find that much fun in it. Elsweyr could have been great, but overreliance to dragons and furry, the inconvenience of wayshrines and all over main quest made it so average. For Skyrim and Blackreach nostalgia I can launch Skyrim. Of dlc Orsinum, Clockwork city and Markath are great and Drgonhold and even Murkmire are good, too. Thieves guild and DB are also worth it. Too bad later chapters are so thin in substance and so average compared to zone dlc.