Same here, I loved New Vegas, but there's nothing new here and I feel totally underwhelmed.
What could they add that is new? VATS is better in this, quests and story details are way better, shooting is better. Though New Vegas literally had worse shooting than Doom 1993 so that isn't hard. I couldn't think of a feature fitting for the genre that this game doesn't have already.
There isn't one aspect that is not better in Outer Worlds except the world and lore, but Fallout had had 20 years to grow and this hasn't even had 2 months.