I love the settlement building elements in this game. I'm a big fan of FO4 although I haven't completed it because I had problems running it on my ancient computers when I first bought it a few years back. It's currently in my rotation and I think it's a classic.
In most games you're the hero because you're killing monsters/bad guys. But in this game you do that and you actually feel like you're making a difference by cleaning up the waste land, recruiting settlers, giving them a place to live, taking care of basic needs like food and shelter. That just adds another dimension to the game that is lacking in Fallout 3 and New Vegas.
It's pretty cool going back to one of the settlements and seeing the settlers farm, defeat monsters and generally just live their lives.

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