Originally Posted by Wool
1) Oblivion
Way better as a PC game simply because you can mod the heck out of it. Adding both amusing new user made content, and fixing some of the crap that is wrong with the game itself. It was designed for both. It's a very obvious PC based rpg, but it has a few elements (such as the interface) that were obviously designed to be console friendly.
Haven't played on 360, or expansions. Oblivion has great graphics. Faces are sometimes pretty bad, but the rest is good. Morrowind was hard to stand in comparison.
Oblivion sort of fun. Fun level goes up if you like to wander around aimlessly and just explore a great huge world. Oblivion fun goes down if you get caught up on how bad the game mechanics are (mod that sucker!) Oblivion fun also goes down if you try and do everything, you end up getting carried away and never actually finishing the game. ;)
Lore is huge in Oblivion, youcan read in-game books for no other reason than to read background lore. I would suppose that for the last two questions, that Oblivion makes your character feel like an important part in the world as it changes. NPCs will remember what you do and react accordingly in a few instances.