Ugh! >.<  I dunno what it was about Oblivion, but I just found it the least immersive.  Still a fun RPG, but just the character designs, they were just so...blugh, and the way they stared at you dead eyed really creeped me out.  Still had a blast playing it but not as much as Skyrim.  Still need to play ESO, but from what I hear most people are badgering that it's a broken mess.