the basic game is very lacking the exploring spirit content.
I don't agree. You're not constantly stumbling around in fog (Morrowind) or getting lost in dense forests, but I think just strolling around and ending up somewhere you've never been before is a lot of fun.
Personally, I'm still on my first character since 11/11/11 (about level 35 now), I don't know what it's like when you've done everything. But walking around as a demigod that has mastered everything, done every quest was already a bit ... dull in Morrowind and Oblivion
