More On Oblivion
So - been playing it on and off since the weekend now, and I'm really enjoying it. It offers supposedly completely freeform gameplay, in that you can go anywhere on the map, follow the main quest, unconnected quests, or no quests at all, and essentially the challenges you face will get harder as you get better, rather than there being areas that are designated as being suitable for certain levels of character.
(This 'level balancing' is something that is causing controversy among some commenters online though.)
I miss the ability to interact with other real people that something like World of Warcraft offers, but that said, they're different types of game, so it's not really fair to compare them.
It's fun to dip in and out of, and it's helping kill a bit of time until the Warcraft Expansion is out in a few months' time.