If Bethesda had offered more enemies (in terms of numbers, and spawn locations) as well as more entertaining side missions (instead of go kill these raiders) - then I would have given it a 10. This persists in Far Harbor, the missions are great, the island is haunting, and the weapons and factions are nice, but once it's over, it's the same thing as the main game, a limited quantity of things to do, aside form settlements. So if you want to have many enemies to kill and get legendries, there are not too much, and once you get to level 80 or so, the remaining enemies can't really harm you much, even at very hard difficulty level.
Why then an 8? Well - my MAIN disappointment in about the main game is that, once the quests are over, there are relatively little enemies and/or INTERESTING side missions to do, so all you can focus on is settlements - which are nice - but don't add much in terms of combining well with the rest of the game. Many options to finish the missions and solve the conflict, as well as cool enemies and atmosphere, if FO4 would have has the same amount of options in the game, it would have been the best in the series. Why then an 8? Well - my MAIN disappointment in about the main game is that, once the quests are over, there Many steps in the right direction, quite similar to New Vegas in many ways. Many steps in the right direction, quite similar to New Vegas in many ways. So if you've enjoyed the main body of Fallout 4 I would definitely recommend you foraying across the sea to explore Far Harbor. I have never had any problems with the frame rate or crashing that other people have mentioned. Far Harbor is a BIG addition, and provides a lot more world to explore and more settlements to build if you're into that (which I am, in a big way!), so as I had a handful of thriving settlements here, even once I'd finished all the quests and story lines I was still travelling back and forth to maintain my settlements there, and it integrated well into my game ongoing. There's some terrific new story lines, particularly one involving one of my favourite NCPs from the main story, and quite a bit of new gear that's a great addition to my collection - including a nice set of distinct power armor and one of my top three favourite guns in the whole Fallout 4 world. The environment is atmospheric and beautiful in a very dark, dank and gloomy sort of way. Having said that, I didn't love the DLC's quite as much and was pretty disappointed in several of them. I have totally loved Fallout 4, and have spent hundreds of hours happily engrossed in poring over The Commonwealth and all its many challenges and pleasures.