Take Frictional Games's Amnesia for example. They used many home-made sound effects with low budget and they are an Indie company.
Here is a video made by Frictional to showcase their sound recording. http://www.youtube.com/watch?v=Q06d40zChDM
I don't know how bethesda does it but in one of their Skyrim videos they used a computer but i don't know if the sound effects are recorded or are they just taken (bought ?) from a sound effect library.
Who agrees that Bethesda should take authentic and original sound effects?
-Emp-