Set Steam to Offline Mode to avoid this -- you should only be using Steam in its normal mode if you want the other features Steam offers. In which case it's not Bethesda's fault, as you DO have the option of Offline Mode. You can use Offline Mode forever.
Right now Steam's servers are getting hit hard due to holiday sales, so if it needs to patch or something you just have to keep trying until it works. Or until "Offline Mode" works, if you choose to use it.