I never played enough of the couple of Elder Scrolls games I tried to say too much about them (few hours of Morrowind, maybe half an hour of Oblivion), but I did play Fallout 3 through the full main story, and I'd say it falls squarely into the category I described. It's big, but shallow, with a lot to do but none of it worth doing. Combined with how unimpressed I was with what I played of Morrowind, that's lead to me just avoiding anything made by Bethesda. (Oblivion I mostly played to see if using its third-person perspective would help my dislike of its first-person based gameplay at all - it did not.)
On that, I fully agree.