Ill just say this. I have played all the previous MGS games and I still didn't understand the story to MGS4. The game isn't tailored for even the general fans of the series. Its strictly for the hardcore fanbase that know everything. I still enjoyed the hell out of the game, but I still had to check up on wiki files afterwards to fill in some gaps which I don't think I should have to. Although one big advantage that MGS4 has over other games is that its gameplay stands up just as strong as the story. Even if you don't enjoy the story there is still an awesome stealth game in there.

And the PS3 version of Fallout 3 is fine. Its just the draw distance is slightly poorer. There are other bugs but I hear they are present in all versions of the game.