A flawless game on all facets, this game will consume at least over 100 hours of your life.
If you were wondering if this game is an offender of the new "ulra-short single player campaign games" trend, good news, it isn't. This game in total will consume over 100 hours of your life, and not only is the main quest there for you to take on, but there's also many faction quests you can take on, and the main faction quests are the Fighter's Guild, Mage's Guild, Thieve's Guild, and the Dark Brotherhood. The main quests will take you anywhere between 10-25 hours to beat the first time through (without including the faction quests), and even the main story will amaze you.
The customization and free access in this game is extremely in-depth, and it has a leveling system, in which you have to train your character it's major skills in order to level up. Leveling up your character comes many great benefits, but many challenges as well. As you level up your character, new armor and weapons will begin to appear, and the more you level up your character, the cooler they'll get. Once you reach level 20, the coolest of the weapon and armor will begin to appear, and this includes Daedric armor and weapons and glass armor. But the bad news is this; when you begin this game, it'll start out very simple with the lowest grade weapons and armor only appearing, and you won't be seeing all the cool weapons and armor you see in this game's screenshots until you reach the double-digit levels. The challenges that come to leveling up is the enemies you face. For example, once you reach around level 6, you'll begin to face Fire Atronachs, and once you reach the later levels you'll be facing storm atronachs, which are 2-3 times as challenging as the fire atronachs are. This game mainly focuses on the level system of the character you create, and leveling will satisfy most people, but some people will begin to hate the leveling system.
The main boss enemy of this game is a Daedric prince by the name of Mehrunes Dagon, in which he has a plot to destroy Tamriel, and rebuild it for the Daedra to take over. If you're thinking that there are cults that worship Mehrunes Dagon, you're right, and the cult's name is the Mythic Dawn. The Mythic Dawn's leader is Mankar Cameron, and he has a lot of magical powers on his side.
You're in fear of wasting your money on buying this game, aren't you? For most people, it's guaranteed that you won't regret purchasing this game with your money, as it's 3 times worth the money you're spending on it. The reason why this game has so much replay value is it's depth, in which Oblivion will give you the option to do whatever you want, and you can be either a good character or an evil character, it all depends on what you do in your spare time in this game. You can go help every single person you see in Cyrodiil, or you can break into people's houses at night and steal their valuebles. Not only that, but you can kill them in their sleep. The main fun part of this game again is the freedom part, and it's guaranteed that it won't disappoint you.
This game may not be for every single person out there, but it's definitely for people who have a growing interest in RPG's or hardcore RPG fans. The only flaws in this game are it's loading times and no online, and those can certainly be negatives, but not enough to overpower the positives of this game. So is this game worth purchasing? The answer is yes, definitely.