Besides being greedy as of late. Bethesda has always been good at crafting open world's. And most of their games were the current bar for RPGs in their days too. I think it's impossible to say that a lot of inspiration for whatever open world can't be traced back in a way to some Elder Scrolls game.
Sadly, Bethesda's games are not for me. I cannot say I enjoyed any out of 3 I played.
Fallout 3 raped fallout's lore, timeline and simple logic so badly, I cringe every time soeone mentions this game. Not to mention completely forgettable characters (I remember like ONE side character from this game).
Skyrim was kind of fun to play, but it's main story was so god damn generic, it was unbelievable. I did spend over 400 hours on this game, along several playthroughs, and it suffers from the same issues that Fallout 3 did - uninteresting quests that most of feel similar; boring, flat characters; terrible main storyline...
And then there's Dishonored, which almost everyone praises, but I barely even finished it. I enjoyed new Thief more, than I did Dishonored, despite the fact, that from gameplay and technical perspective it was a much worse game.
So I don't have much of an expectation for Fallout 4.
I'm hoping more for new Mass Effect game. BioWare's writing team has not been doing so great for a few years now (Mass Effect's 3 ending, entire DA2, Dragon Age Inquisition's ending...), but they're still better than Bethesda's writers.
But matching The Witcher 3 seems almost impossible now, for either of this companies. Although I'd love them to prove me wrong. The better games come out, the happier I am...and competition means even more great games in the future.