Not at all, actually. They were pretty similar to Morrowinds. Assassins Creed is a persistent free roaming game that only came out about a year after Oblivion, with animations approximately x12,000,000 better.
Umm no, Assassins creed is not a persistent world, it's heavily instanced. Also, Assassin's creed is an action fighter game, the animations they have were like 80% of their work. Though I do have to say they were beautiful. As for Oblivions animations being similar to Morrowind's......were you high when you played Morrowind? The animations on Morrowind are HORRENDOUS. Oblivion has good animations. Not great but good. They were highly acceptable for a development time of 2002-2005 while Assassin's creed was 2006-2007. Btw, I miss Altair