Since Skyrim was released its been skyrim, Skyrim, skyrim... And Oblivion has sat in the case.
I just put Oblivion back in to play as I wanted to walk the borders to see how they line up with Skyrim (Skyrim is much more realistic as it actually has road leading in and out which Oblivion unfortunately lacks) and I was surprised how much I prefer Skyrim in terms of controls and combat etc
Oblivion is still great and is very colourful in terms of graphical content etc but the whole feel of the character control is no where near as good as Skyrim IMO.
I didn't realise the extent until I just put it in to play. I also kept waiting for my character to slowly heal but realised I had to keep healing myself which was frustrating.