Anyone played Skyrim: Dragonborn?

Indeed, the main story is quite short, but there are many hubs for side quests. Overall, there's a lot more new content of all types (quests, exploration, items, mechanics) in Dragonborn than there was in Dawnguard, it just lacks the epic-length main storyline. Also, they added most of Morrowind in more detail so you can see/walk on it, though I assume it's still an out-of-bounds area; there are no cities, vegetation, etc, but you no longer fall though it...

I particularly liked Apocrapha; there were times when I felt like it really was pulling me toward insanity. It's unfortunate that you can't reset certain parts of it; I blitzed through most of it for the main quest and missed some spots. Also, I later decided I wanted to build up my library (definately the most book-loot-rich "dungeon" in any Elder Scrolls game I've played), but some earlier areas were inaccessable.

As for the landmass itself, it mostly feels different, though it's been a long time since I've played Bloodmoon. Obviously, hundreds of years change things, though...