Gameplay is greater than graphics!
In terms of bugs, I've played about 10 hours and havnt ran into one yet. Getting low frames isnt a bug but is a performance issue which many new games have that are quickly adressed. Already there is a patch for the PC out that has fixed and addressed issues. The game has a lot of content in it and companies cant find every bug. With thousands of thousands of players playing the game someone is bound to find a bug, And the game is far from un playable. If they were to have delayed the game to polish it more, people would of had a b*tch fit.
Soo far the quests in the game are very dynamic with many different outcomes. The game does promote exploring alot, but you bought a sandbox game, what do you expect? Don't believe i've gotten to far in the main storyline and while its nothing amazing, i wasnt amazed by the Fo3 storyline either. It's all about the sheer amount of other content that can be done in the game.
I don't know if these others that are getting the disastrous bugs are unlucky or just over exaggerating, but I havnt found any of these. No freezes No lock ups, and have played several hours straight. Though it should be running smoother than it is. Its far from disastrous. You cant expect a couple game testers to find every single little bug in the game unless the test out the game all year....when millions of people are playing the game, a lot more un forseen issues surface. And the majority of players arn't having any issues at all or very few, Its the un lucky ones who are complaining on here that you hear...Game has been patched some for the PC already, consoles will be soon to follow.
If you enjoyed fallout 3 you will definatly enjoy this one most likely, and personally this feels more like the true sequal to fallout 1 and 2.