Elder Scrolls V is dumping it for the Creation Engine, which Bethesda developed internally. Hopefully it's better.
True, they are finally making a new engine for Skyrim. But will it be any better than Gamebryo? Let's not cross our fingers. Remember: It's still a Bethesda game. Come hell or high water, they are determined to release the game on time, no matter how many bugs there are, no matter how unstable or how unoptimized the engine is. That's just what they do. They're gonna work as hard as they can up until release day, do a sloppy job, and release an unfinished product. Yeah, it's a NEW engine, but unfortunately we can't say if it won't be just as bad as the old one. /2cents
As for Fallout 3... it runs ok on my machine for the most part, but there are still those "Fallout 3 has stopped working" type crashes. Also, I'm one of those OCD people who is obsessed about keeping their PC optomized, not having unecessary programs installed, always keeping up-to-date, among other things. So yeah. Even those with "perfect computers" still experience crashes with Fallout 3 I think.