Be able to wield any weapon with one or two hands.
Stamina depletes faster the more you are carrying.
Hand placed loot of high value instead of generic "Power Amulet of Ultimate power"
non linear dungeons
Severe status ailments. Compare Dark Souls curse to Skyrims Rockjoint.
Slower movements speeds with heavier gear.

....
I suppose that makes up for the fact they are pretty much all the same. Unique and interesting dungeons that are fun to go through make up for being linear.
.. dont know about morrowind but the dungeons in oblivion was just plain ass. 