The texture quality can be great in Gamebryo, it's just that it doesn't have good enough lighting, shadows, and everything else for that to be enough. Although, some guy on Nexus is making a mod that overhauls lighting, and adds ambient occlusion to objects in game. At the moment the bloom is a tad overkill IMO, but the things being added are fantastic. Hopefully something like this will be released for Vegas. Sorry consolers

http://www.fallout3nexus.com/downloads/file.php?id=11434