Oblivion allows players to escape into the beautiful plains of Cyrodiil, what you do there is your choice, and believe me you won't be short of options.
You can grab the Game of The Year edition from Asda for £8.93, which is a bargain for a game of this calibre and'll save you just over £1 on the next best offer of £9.98 from Amazon and GameStation.
The game allows you to explore a massive environment, every inch of which looks amazing. The longevity of the game is just as impressive, and I've clocked up well over a hundred hours without even scratching the main quest, spending the majority of that time joining and working my way up the various guilds and completing the numerous side quests that are dotted around.
The gameplay is a mix of first person shooter and classic RPG, with the option to switch into 3rd person if you prefer. Your time'll be divided between talking to the huge number of characters you'll find throughout the game and battling enemies using weapons and magic.
The Game of the Year edition also includes the two expansion packs, Kinghts of the Nine and Shivering Isles. Kinghts of the Nine is quite short in comparison to the majority of quests in the game and the armour you'll receive on completion isn't bad but you'll be stripped of it if you do even the slightest thing wrong, which is incredibly frustrating as you'll have to go on a large pilgrimage around the environment to absolve your sins and wear the armour once more. Shivering Isles is much bigger by comparison and takes place into an insane realm, which is divided up into two sections, Mania and Dementia. I love the contrast to the rest of the world that Shivering Isles offers and the weapons and armour you can pick up are among some of the best you'll come across.
Oblivion is still one of the best games out there and is a great investment as you'll be able to create a range of unique characters for multiple play throughs, which should keep you entertained for a long time.
Thanks to goonertillidie @ HUKD