I don't know what were those complaints about but I think Fallout NV played very similar to Fallout 3, with just some good improvements. While Fallout 4 is quite different. You spend a lot more time shooting now than before, since you don't have much to talk with NPCs, Previous titles also provided better replayability and more options for roleplaying.
I'm not sure why you're making this to sound like we're trying to insult someone with "dumb down " phrase. It simply means that they oversimplified certain aspect of a game and arguably make it worse or less enjoyable for no good reason.
I think you're making a big deal of something that is very simple. You're making this out like I have huge list of little things that bothers me and i'm the only one with these complaints No, I barely gave two or three examples that are huge parts of the game and I'm sure a lot of people agree with me, especially as far as I've seen in reviews, forums and talking with friends. So it's not really much of my own criteria I'd say. Even if you want to call it my own criteria, it doesn't matter, because a lot of people agree with me. I'm not saying we're majority, but like I said, time will tell.
Also, see, you said it yourself, that outcry made them make DLC for Fallout 3 to change endings (i totally forgot about that). So, what you said earlier that giving feedback will likely change nothing was not the best response. It may change or it may not. Reviewers also often take on fans feedback and it reflects in their reviews, so Bethesda doesn't have to read forums, they will get the feedback from other sources.