The bugginess of Oblivion, The leveling up system, The lifeless NPC's, for the pc version i would like to see something like civ 5 had for mods that made them super easy to install, having more hostile NPC's and more factions you can join with war's and diplomacy in between the factions, and A LONGER AND LESS BORING WITH MORE POINT MAIN STORYLINE Oblivion's main story was boring i thought Martin telling you to do this and that and close this oblivion gate and he gets all the credit... that made me feel very special -_-...
Diceroll system from Morrowind. Topic dialogue from Morrowind/Oblivion. Unnecessarily long variety of topics from Morrowind. Oblivion's soul charge system for enchanted weapons. Heavy Armor and Light Armor being skills. Oh wait... Random unpolished dialogue between NPC's. Cliffracers. Those spider girls that shoot lightning, spawn a paralyzing mini-me version of themselves and can heal themselves. That ugly ass character creation system which makes next to every Altmer look like carbon copies of one another. Copy pasta dungeons. Enormous gameworld with bugger all to do in. NPC's marked as "unkillable". Not being able to enchant arrows. (I could not do it in Oblivion at least.) Psychic guards.