Never played Morrowind (true story), did enjoy Oblivion, but didn't really get too deep in to it, the staticness of the world was bit of a downer. Did a side quest here and there, then finished the main quest and tried some mods. Re-installed it earlier this year with all the bells and whistles mods, but just didn't really enjoy it. The game had simply outdated too much, even with all the nice graphics and content mods.
Loving every second (well nearly, that damn crappy UI..) of Skyrim though. The world just feels more alive and dynamic than before. The amount of stuff to do is just mind boggling.. if I try to clear up my quest list by doing a side quest, I end up with 3 new ones while at it!
Currently 28 hours in to Skyrim, level 15-16, barely scratched the surface of the main quest. Just enough to get the shout system going, so I can fully enjoy doing the side quests.