I certainly agree that so far, Fallout 4's DLC content has been really lack luster. I haven't played Far Harbor yet, but I did play through Automatron and play with the other minor DLC content. All of that added up to what I would expect from like a $2.99 DLC pack. It was a few hours of extra stuff, but nothing special.
Fallout: New Vegas and Fallout 3 and far more extensive DLC content that added a great deal more to the game. Old World Blues had so much content it was like playing an entirely different Fallout game, as did Point Lookout for fallout 3. That was just one DLC pack for each, and maybe Cold Harbor is on par with those, but each of those games had three other major DLC packs too. I bought a season pass for $29.99, and unless they have something else coming maybe next year, then I'm going to be extremely displeased. Probably will be the last time I buy a new Fallout game. Instead, I'll just wait and buy it heavily discounted.