8/10 seems a fair, perhaps even charitable, assesment to me, based on my own experience with the game. 70 hours and I find myself a little bored and already taking a break from it. 70 hours is a lot, no doubt, especially compared to most other games that come out, but the fact that I am not even that interested in doing another playthrough to do different things does raise a red flag for me when it comes to a Bethesda game. Morrowind, Oblivion, Fallout 3 and Skyrim have all had the "I'm gonna start over right away with a new character" thing for me. Fallout 4, sadly, did not.
Is there anything objective about this? Well, the game world felt a little small because of so few settlements that are not either building sites for you or Radiant Quest locations(Minutemen, anyone?). Diamond City had potential, but there seemed to be too few people bothering me with random information about the place or the land around. And I felt I had too few people to bother about the place they lived, the world around or the faction they belonged to. There are so many things I wanted to ask the various members of the Brotherhood of Steel, for instance, given which chapter of the BoS we actually meet. Visually the place often feels like a re-used Capital Wasteland, which takes away a lot of the exploration factor. The bloody Institute, and the Railroad! Those sounded so intriguing when you briefly encountered them in FO3, but now I am kinda bored with them already.
I'm not a huge fan of the levelling system. I'm not a purist who needs to have a bunch of numbers on screen, I even prefer Skyrim's system over Morrowind/Oblivion in a lot of cases, but I'm not that eager to see the FO4 system again(or that in any previous TES game, for that matter, though to a lesser extent). The skills being worked into the attributes and perks is fine by itself, I just didn't find it very engaging. Entirely subjective, as I haven't put much effort in assessing the actual depth of the system as of right now(nor am I likely to in the immediate future). Honestly, as of right now, I think FO3 is the only BGS game of recent years with a decent character system. But, as I hinted to in the beginning of this paragraph, this is not the big issue for me. What kills it for me is that I don't find enough of the Wasteland here to be bothered with random information about. There is not enough of it in the settlements, and not enough of it in the dungeons. Compared to Skyrim's OCD for filling almost every little landmark with some story and the TES classic behavior of NPCs of giving you random information about whatever they are affiliated with(faction, settlement, political view, race, blablabla.), and Morrowind's pouring much of the foundations of what would become the modern TES lore, I feel FO4 falls short.
I think this is a mistake on BGS' part, since, at least for me, the game mechanics were never the decider for the playability of their games, within reason of course. Morrowind is clunky as hell, but I still enjoy to leave for Vvardenfell once in a while to explore the island or do faction stuff, or just helping(or harming) random people I meet(as long as they don't ask me to escort them. Bloody hell, the pathfinding by NPCs was awful). Oblivion plays better, but lost a lot of the exploration factor, but the Guild stuff, DLC and Daedric Shrines are still a lot of fun. Skyrim does fairly good at giving an insight into Skyrim, excellent exploration(because of the previous OCD I mentioned) and good non-magic gameplay(magic kinda got shafted a bit in the game),
This is a real shame in my view, because I think a lot of the gameplay is at the peak of BGS' work as of now. The combat feels more balanced than ever, avoiding both the trapfalls of ludicrous tediousness without much challenge at high levels in Oblivion and the cheap nature of some of the DLC high-end enemies in Fallout 3. In FO4, high end enemies tend to have a lot of health, yes, but not absurd amounts and are made a challenge by having other things, like a really good weapon that makes the encounter more fast-paced and dynamic. VATS is fairly balanced, iMO, since it no longer stops time and requires a very high Perception to be very accurate. The addition of Legendary enemies that will mutate and drop an item that is given a special secondary attribute is great, IMO, because it makes killing them worthwhile because they can give you something you can't just make at an armor workbench. Same with unique items in general, having those secondary effects and still being modable.
Power Armor feels like, well, Power Armor. I have a slight issue with the Fushion Core mechanic, but that seems to not be much of a problem in the late-game(especially with the Nuclear Physicist perks). It adds a nice hobby, to find or make new parts or upgrade the model, finding the Hot Rodder magazines to get new paint jobs. The T60 armor is frikkin' badass.
I like how radiation is handled, making it a more direct threat to the character than it felt like in FO3. That it steadily chips off at my max health until I see a doctor or take RadAway made it very relevant, in that I actually had to consider it before every larger fight I got into.
Companions are generally good, with their own motivations and all of that. Not very deep, but enough to make them more than random weirdos that follow you around because reasons. Some even have quests associated with them. Yay.
Details like the BoS flying around in their vertibirds, engaging whatever hostile pieces of [censored] inhabit the Wasteland is a nice touch, giving a gameplay reflection to the activities of the BoS, so not everything has to be stated in a random dialogue wheel somewhere.
In short, I find that FO4 does a lot of things right(though if you think that Oblivion and Skyrim were pushy about the character doing the Main Questline, you're in for a treat), but the world does not engage me the same way previous BGS games have. Is any of this objective? No, this is all my subjective experience of the game based on my first playthrough. Maybe when I pick it up again, it will feel fresher.