This game is my all-time favorite. My cousin bought it when it first came out and I learned the game by watching him. I kind of hated it at first, but I started to like it after playing it. We played without any mods and we didn't know how to exploit enchanting and alchemy system. We ran around in circles trying to do quests and end up getting involved in some other quest or dungeon. I kinda liked it. You actually had to pay attention to road signs and ask for directions to strangers.
There was a pair of magical boots called "boots of blinding speed" which increased your speed but almost completely blinded you. There was a guy who fell from the sky in the wilderness near Seyda Neen (I think it was a levitate spell experiment gone bad) and he had a good magic longsword for starters, and it was the sole reason why I always took long blades as one of my major skills. I always held onto that sword for a long time. I remember walking and hearing this scream from the sky, and when I looked up, I was so startled to see that guy.
I always took Sneaking, Alchemy, Light Armor and Long Blade for my majors no matter how many times I started anew.
I did lots of hardcore roleplaying with and without mods. I remember jumping from rooftop to rooftop in Balmora like a parkour freerunner and robbing top levels of houses clean without being seen to the residents. I remember crafting woodcrafts to sell, spend my money at the racist Dunmers' cornerclub, and try to collect enough money to buy a house and furniture. I made the economy really difficult and I never looted armor and weapons out of corpses so it was very challenging. Before I learned about the house mod, I killed the resident of a shack in Seyda Neen to claim it.
I have the route from Seyda Neen to Balmora and Caldera completely memorized with all the walking and dungeoneering I did around these routes. Drop me in any place around the Southern coast and disable the map, I'll find my way. I don't like the Northern parts of Vvardenfell though.
As for the expansion packs, Bloodmoon was really awesome. It was fun to build a frontier settlement and getting to decide what to build and where to build. And being a werewolf was much more interesting than in Skyrim. It's not like in Skyrim where you turn voluntarily. Every night, you'll transform and have to kill a humanoid. If you don't kill, you start to become weaker. It's easy to manage in Solstheim with the amount of respawning bandits but it's difficult in Vvardenfell. I had to do old-school city raids and kill guards (only source of respawning meals I knew) for that.
I kinda hated Tribunal though. The whole time you are in a damn city that's the size of four average Skyrim cities combined.
Man, good times. I last played it a year ago, I think. I was in the middle of the Tribunal main quest. Never managed to finish it.