I don't want to be that "Morrowind fan" who endlessly rants about how much better TES3 was than TES4, but one thing it definitely had an advantage in were enemies. I mean, you had the standard fantasy stuff, plus different daedroths, cliff racers (lol), alits, netches, scribs, kagouti, kwama dreugh, golden saints, guars, Dwemer centurions of varying shapes and sizes and honestly way more that I can't remember
I hope Skyrim has a lot of cool looking monsters and stuff that makes you do a double take like in Morrowind. Oblivion seemed to have a really small selection of monsters and most of them were just your typical fantasy monster.