By the Nine Devines...I'm never gonna finish this game...
Worst Feature: THERE IS SO MUCH TO DO! You'll never do it all without using a huge chunk of your life! Game is buggy in a some places.
Move over Grand Theft Auto! You thought you showed us the meaning of free form gameplay!? You know nothing! Oblivion has shown me that, even GTA gives you a bit of a direction to got in from the start. After escaping the prison to learn the controls, Oblivion basically gives you no objective and allows you to make your own destiny.
This game does have a primary quest arc, the side quests outnumber the main quests several hundred to one. This never leaves you with a shortage of things to do, and even after that you can level up just about any ability or magic type you can think of, in a very unique way. Not buy simply defeating monsters, it all functions on how frequently you do different actions, how quickly they level up. Fight with a bow a lot? Your Marksman skill will increase very quickly. Use healing magic a lot? Same deal, your Restoration skill increases quickly.
Not only that the world itself is amazing, (If you liked Lord Of The Rings, you'll feel right at home) but unlike other games, every action you make has a effect. It could just be something small like picking a flower that won't grow back for a few days, or large like the murdering a citizen which puts an immediate bounty on your head. Everything affects the world in some way, and your standing in it. Be a good boy and people will slowly begin to recognize you for the hero that you are. Commit wanton murder and theft, and you'll become infamous for you deeds, so much so that the churches will refuse to off your blessings. (And I thought that they were all about forgiveness...)
With so much to do, and so much possible this is really a fantastic game, but its not perfect. It can be pretty buggy sometimes. On occasion there is a random Windows crash, a sound glitch or two, and I have even been attacked through an object, but these are rare. I was even prevented from completing a quest because a person I required for it walked randomly off of the entire game map and never returned.
But despite that, there is so much to this game that a few missteps are easily forgivable. I have spent almost 90 hours with this game and I still don't think I'm anywhere near an end. A game that can occupy this much time is well worth any $50-$60 price tag.