Rated PG but not an RPG. Also, it's one of the best games ever made.
And you can take this to the bank:
2006's GOTY marks the last time that so much singleplayer content is ever released in one box.
With the console coding and piecemeal pricing schemes that publishers are insisting on so they can gobble up even more money, gamers will never again see a single release with this much stuff to do in it.
Ever.
Baldur's Gate II holds the top spot on the list of the last generation of gamers' titles with truly epic amounts of content, and it marks the end of an era.
Oblivion is the first (and last) meeting of the gigantic action RPG with a world of consoles and the modern game corporation's marketing department.
With time it will become a touchstone for above-average and discriminating gamers of this generation.
In, say, 2016, there will be a few stalwart gamers in their mid-20s and early 30s whining on message boards, longing for a modern game with the truly epic scope of Elder Scrolls IV.
At release it was something of a technical triumph. It looked fabulous (and it still does-- the foliage is still the best ever, in my opinion).
But, most importantly (and I won't do it justice in just a couple of vague sentences), there is simply an ungodly amount of things to do in Cyrodill's lush, rolling landscapes. 200+ hours of gameplay await you if you complete the four main storylines and tackle everything else the game has to offer.
Worth noting (since in a land of marketing buzzwords actual attention to detail gets overlooked) Oblivion did other things right. Little things. Looting NPC homes or shops requires that you not be seen-- NPCs don't stand around like mannequins if you start rifling through their stuff. Rings and necklaces actually have models and appear on your character when equipped. Similarly, swords actually have scabbards.
Please name another PC game, two years after Oblivion's release, where weapons aren't just lazily floating on the character in an MMO-inspired design copout.
Oblivion has fine attention to detail as well as a gigantic scope.
It is immense, immensely entertaining and magical.
And if you are a gamer that hates it, that pretty much tells me all I need to know about you.