I have only just completed Fallout New Vegas for the first time, and have since reinstalled Fallout 3 along with mods for another playthrough. It is immediately clear to me just how much of an improvement FNV was, albeit a completely different game.
I have to say however, how disappointing the Skyrim DLC was, with Dragonborn being the only substantial effort from Bethesda, while the other two are more comparable to horse armour DLC.
Focusing on an Elder Scrolls MMO, I expect they won't begin work on another game for a long while, if at all. At the rate Bethesda is pumping out games these days, while high quality, I'm concerned they have abandoned individuality in an attempt to rub shoulders with the likes of EA, Activision and Blizzard.