If going from whatever you usually play to oblivion was a hurdle than going from oblivion to morrowind may be nothing short of a shock.
Overall I think it was way better. For one it's way more expansive: dozens of towns, the main quest takes ages, joinable vampire clans,... Just to name a few things.
But you are gonna have to bear with it's odd perks: there's some serious balance issues with some skills, no quick travel (wich is not such a bad thing because it makes things more immersive but you WILL curse it), enchanting is way more complicated than it should be, the graphics are meh even with mods,... Oblivion may have gotten a lot of things wrong but it fixed just as many of morrowind's problems.
And finally: for better or for worse, it's "realistic" compared to oblivion. Stuff doesn't level up with you so you can and will run into monsters that can 2-hit you (quicksave is your friend). Especially when you are low level. And deadric/glass/ebony stuff will not only appear when you are high level yourself, it can be found at any level. Sometimes you will even find it just laying about on a shelf or something. In fact, I know of a way to get yourself 1 deadric weapon of your choice and a small fortune without fighting a single monster, wich can be done at any level.
Note: personally I find the balance issues not such a big deal. In a multiplayer game it would be a serious problem because everyone would flock to certain skillbuilds but in a single player game it just adds realism. After all, not all skills are equally usefull and figuring this out is part of becoming stronger.
Final tip: don't make a pure magic guy for your first character. Making a good mage in morrowind isn't impossible, but it's nearly a science.
EDIT: ohohohohoh you want details eh? Ok, buckle up!
-Non-generic setting: the first time I saw their local mode of transportation I thought it was a bossmonster
-Have your own castle/town built
-Memorable locations: from swamptowns to huge cities to mushroomtowers.
-Tons of factions, most of them joinable, some secret. All of them have loads of quests and becoming their leader or whatever takes an actual effort. They also have rivalries going on so sometimes you will have to pick a side.
-Way more weapon types: For marksmen oblivion just has bows while morrowind has bows, crossbows, throwing stars and darts. There's also an entirely new weapon type: spears.
-over the top magic: it's hard to get into but given some research you will eventually find yourself nuking cities with one spell and crossing the map in a single jump.
Honestly I can go on all day