Puff over at Sorethumbs.com apparently has quite the problem with Bethesda making Fallout 3, well, Fallout "3" - and brings his views on the matter to light. Some excerpts from his blog -
The key reason it should be renamed is when you drastically change the rules and gameplay, you have ultimately changed the game. If Tetris was changed into a FPS, is it still Tetris or would you call it something else? GAMEPLAY IS INTEGRAL TO A GAME. So when Bethesda changes the Fallout gameplay while keeping the name, of course I'm going to say “Bethesda butchered the series.” It doesn't resemble the rest of the series at all. Any pissed Fallout fan has the right to say so!
Carrying the title “Fallout 3” makes it an offensive grotesque of the original series. The choice of changing the game to a jumbled up FP/TP-RPG/Shooter without changing the name was a marketing move with no concern for the originality of the series. When Interplay was forced to sell the game because of Black Isle's bankruptcy , Bethesda bought the chance to capitalize on the name with no regards for the actual game.
You can read the whole article How Bethesda Butchered Fallout 3, here