I have to say, when I started playing it was fun and exciting, but now the more I play, the more I'm disappointed.
The game would be great if I had never played any previous titles before, but as I have played Fallout 3 and New Vegas, I just can't get past some of the things that were removed/dumbed down, like dialogue system being one of the main examples. There are few decent followers around that tells you their story, but other than that, it feels like most NPCs are there just to give quests, there is nothing else, nothing interesting about them to make you remember them, because you can't talk to them about other stuff.
And then there are some new features that look awesome at first, but once you get into it you see it's really lacking and seems unfinished. Two best examples: Crafting (most of the cool looking stuff has no stats and can't be upgraded even with the mods that you get from certain quests) and settlement building (often more frustration than fun. It needs more "optimizing" and way more stuff to build with).
Then we have main story, I haven't finished it yet myself, but from what I have read, there is not much of an impact once you finish it. Just like Skyrim, you became faction leader and then what? Can't do anything, doesn't make a slight difference from before when you were just a member, even NPCs wouldn't recognize you as their leader. I'd rather stay regular member, would at least not be as immersion breaking. If you're doing something, do it right, not slap some half done piece of crap into game. But I'll wait for this and see if DLC maybe expands on that in this game.
I didn't even have any expectations, didn't think about fallout4 until it came out and I'm still disappointed. I thought they couldn't ruin the game, maybe story won't be anything special, but other than that it should be fallout, but with more stuff and more quests, more fun yeah? Well, unfortunately.... it's not a bad game, it's still fun, but It's hardly fallout now.