You mean Fallout "Desk-fan collecting simulator" 4?
I genuinely love the game and I love exploring the Commonwealth. But it has pretty crappy elements that are worse than anything Inquisition offers (okay not worse than the requisition quests in DAI because those are still the worst quests in all of gaming).
For once the writing for the most part is abyssmal even by video game standards. The fallout section of fanfiction.net contains better writing than Fallout 4 for the most part.
The settlement building gets tedious pretty quickly when you have to collect all the random junk lying around in Raider bases but you have quite limited inventory space. So you just run back and forth between the place you just cleared and you settlement about 3 times to store all that junk. And I still want to know why the hell the game allows me to build doors when it's absolutely impossible to somehow fit them into a door frame. Also the UI for it is utter crap
Unlike others I don't really care about the admittteldy outdated graphics so this is no problem for me.
Also there are waaay to much Raiders. Honestly it gets old pretty fast if I have to kill 30 Raiders every second dungeon. Even more jarring since actual settlements in this game have about 2-5 inhabitants on average. In the ruins of the actual city one can't even make three steps without suddenly getting shot at by raiders or super mutants.
And of course the bugs and generally bad programming. My character constantly looks into the wrong direction during conversation cutscenes. Ghouls run into the walls, get stuck there and Piper tries (unsucessfully) to kill the one ghoul in the wall while I get swarmed by the others and she does nothing to help me. The local map is unhelpful as f*ck. And codsworth once attacked me for no apparent reason and I had to reload because it was impossible to kill him or tell him to cut it out. He just fainted shortly then got up again and attacked me again right away.
However companions are actually the best Bethesda ever produced and I like them (except the dog, because honestly video game developers just stop trying to shoehorn a dog companion into ever goddammed video game.) . They actually feel like characters now. They are still lacking quite a bit compared to Bioware companions (again with the exception of the dog from DAO, because honestly what is it with the dog companions in every game. Just stop it already.)
No Fallout 4 is highly enjoyable but personally I think DAI is still better (the fact that I greatly prefer fantasy over science fiction probably also factors into it).