@humanity: Yes, that's a sandbox. It's full of sand and a bucket and small soldier action figures left over from some other kid. To some it just looks like a big litter box, but to others it's the funnest thing on the playground.
Would I like it if the main quest were better written? Sure. But asking that the rest of its design change is asking it to be something it's not. You might as well ask that Dwarf Fortress not allow you to embark on frozen haunted wastes or that Toady stop adding random stuff to the game like soap and minecarts.
Literally the first time they showed the game off, they barely talked about the story and instead said, "There's so much shit you can do! You can mod weapons and wear silly clothes and build settlements! Haha!" Was anyone fooled into thinking this game would be story-heavy or that the world would be cohesive? It's a sandbox, and it's a streamlined, updated sequel to Fallout 3. Did people expect Tomb Raider?
But just because they didn't talk about the story doesn't mean it can be excused for having a poorly written story. As for their design changes, they are ambitions and numerous, but a lot of it is poorly implemented such as the base building, the dialogue wheel and the inventory UI. It's not even streamlined, it's inefficient. For example, SkyUI was a far more streamlined and efficient interface than Skyrim's inventory which looks nice, but doesn't function very well. Fallout 4's inventory is very clunky.
We should be criticizing Bethesda for some of their design choices so they can make it better. They don't have to change it so that the game is completely different, people are just asking for them to actually polish their game. Fallout 4 is by no means a bad game and in my opinion it's not even a great game, it's just a good game that seems like a lot design choices didn't get fully thought through. I'm sure modders will create stuff that is better than the current stuff and refine things better than Bethesda will just like they did with Skyrim it just sucks that what Bethesda lacks the most is not ambition but just a general lack of refinement and polish.