10/10 from Eurogamer
9.6/10 from Gamespot
That should be enough evidence to prove Oblivion is a killer-app for the 360 and a must-buy for the PC.
"Ultimately, which version you choose should depend on whether you have a high-powered PC and whether you have an Xbox 360 hooked up to a home theater. If you don't have the former, the Xbox 360 version is a relatively safer bet, and it gains a perk over its PC counterpart by offering some compelling unlockable achievements, enticing you both to finish the main quest and to earn your keep in all the different guilds in the game. It packs a more-expensive retail price, though.
What's overwhelming about Oblivion is how good it is and how much there is to it. Literally almost everything that's ever been done well before in past role-playing games is in here--done at least as well, if not better. From the quality of the story and character interaction to the pure thrill of the combat to all the pleasure to be found in the game's little details--the lock-picking minigame, the alchemy system, the way arrows stay stuck in their victims, the ability to eventually create your own spells, the informative full-color manual, all the different books you can stop to read in the game--these things combine to make Oblivion one of the single best, longest-lasting gaming experiences to be had in a long time. It's just too bad there's no multiplayer.
Just kidding. "