here are the reasons I liked Oblivion better-
1. My friend played morrowind in front of me for hours on end that I got bored of it
2. When I played morrowind I felt like I was just plopped in the world and Bethesda said "well.... here you go... have fun"
3. When I played oblivion, I knew right off what the story was going to be about, and that I was a prophesied person in a dream of an emperor.
4. The way your arms looked when you ran in morrowind really bugged me.
5. I liked the graphics better.
Morrowind was a good game. I never beat it myself, but I just really liked Oblivion and all it offered me. I agree however that the voice acting was not good in Oblivion..... at all. It made me laugh countless times.