Character emotions - Didnt Oblivion featured better facial expresions? sometimes Player and NPC would show angry, scared, serious, happy and joy faces, this is not present in Skyrim, at least i havent noticed any so far in my 80+ hours of gameplay.
Trees and Bushes moving with the wind force - In Oblivion i remember Trees and bushes moving crazy when there was a storm... what happened in Skyrim? i mean they do move... but kinda barely, and havent seen Trees moving to the weather like in Oblivion.
Physics Objects - I remember in oblivion traps of all kinds, these are also present in Skyrim but not much.
Half the options for character appearance - We had twice the options in Oblivion, but yes Skyrim faces DO look much better, still having hard time making an attractive face for my Female Altmer.
Still Skyrim is the best game i played in the last 8 years, also havent had that much issues with crashes like the rest of the people are reporting, but i had liked Skyrim to use more Ram and Cores CPU for better performance.