So you condemn a game on it's engine first? wft is wrong with you? I had no crashes. I do not know what you are talking about at this point.
Well, if the Role Playing Games engine is not capable of supporting role playing aspects like rules, it's a bad engine.
If it can't visualize the environment, it's a bad engine.
If the games engine crashes during the normal operation environment, it's a bad engine.
And if you choose a bad game engine, you can't really actually make a good game. The Fallout 3's engine handled first two parts really well, but it has a lots of problems on the PC and PS3 platforms with the third point. You might be a lucky one and have the 360 version, as apparently the game might have been made for it.
Say quotes from the Wikipedia; Fallout 3:
Shortly before the game's release, IGN posted a review of the game citing numerous bugs and crashes in the PlayStation 3 release. The game also contained a bug causing the game to freeze and the screen to blur when friends signed out of and into the PlayStation Network. The IGN review was edited shortly thereafter, removing all references to the PS3 version's bugs, causing controversy in the PlayStation communities. Reviewing PlayStation 3 Game of the Year edition, confirmed that most bugs remained, citing occasional freezes, several animation and scripting issues, along with other bugs requiring a restart of the game. Even IGN retroactively cited bugs with the original release, as well as the Game of the Year edition, calling it "a fantastic game", but warning players to "be aware that you might have to deal with some crashes and bugs"
Fallout New Vegas:
Even two years after the last official patch the community identifies and fixes bugs left, the latest iteration of Mission Mojave which includes all former patches, has reached a number of 27,000 fixed bugs.
The game engine has had major performance issues on the PlayStation 3. These issues have led to unplayable frame-rates when the save game file gets too big or when DLC is installed. Due to the nature of the game, the longer the player plays, the larger the save file becomes. These same issues plagued The Elder Scrolls V: Skyrim, but a performance patch to improve New Vegas seems unlikely. Sawyer said that it is a core-engine issue that can not be so easily patched.