Ah, The Elder Scrolls... I remember a few years back when I recieved The Elder Scrolls III: Morrowind for Christmas. And what fond memories I had of playing it. I was excited when I heard that The Elder Scrolls IV: Oblivion had been released.
Now, the storyline, well, it's nothing overly special and different. Quite simply, the Emperor is assassinated, you are sent out to find his son, seal the dark gates of Oblivion, save the world, blah, blah, blah, quite honestly, I think we all know how this story goes without me saying much more. Thing is, it doesn't seem like it's extremely important either... I mean, you can go everywhere and yet no chaos breaks out at all. Oh well, anyway, aside from the main story, there are TONS of quests you can do, such as the Fighter's Guild, Mage's Guild, Thieve's Guild, Dark Brotherhood (my personal favorite) and tons of others.
There are many changes in Oblivion that I favored over Morrowind. One, food actually exists and is in practically every home. People actually HAVE lives, as they will go about their everyday business on their jobs, eating, talking to others, sleeping, you name it. Also, the possibility to purchase a horse or a home and furnishings to a home make it even more realistic. Another major overhaul on the realism factor is that objects are actually affected by gravity, while in Morrowind they weren't. When a creature dies, their body will go limp and striking their body will move their body/limbs accordingly. Flames actually hurt this time around... you can actually break out of jail... guards will hunt you down... the list could go on. All of this put together, you can see the depth of reality is nothing short of extrordinary. And the most amazing thing yet- the entire game is modifiable. Mods can be added and anyone can literally create anything using a Construction Set from the Elder Scrolls website, making limitations almost completely disappear.
Overall, Oblivion is an amazing game.