I am a diehard Morrowind fan, but I really enjoyed Oblivion as well. While it wasn't as immersing, I liked all of the improvements to the combat system. For example, recharging magic, using magic with a sword equipped...etc. I also liked all of the new animations and graphics. The story line was well thought out and had a nice twist at the end and I was definitely a fan of the odd side quests like the paintbrush one.