I totally, completely, 100% disagree that the plot in Fallout 3 was better than the originals. Hackneyed, at times completely nonsensical, and linear. If you're so keen on turning Fallout into a sandbox, quit trying to wrestle the controls away from me!
Maybe I don't want to help Dad, and maybe Project Purity is a completely stupid idea I want no part of. How about instead of Dad going "Well I'll be here if you change your mind!" the game actually reacts to my decision.
I also don't agree that Fallout 3's interface was much better than the originals. Too console-oriented. To reach its potential for the PC it needs to be a lot smarter about use of space and drag and drop functionality. Still didn't fix the tabs-within-tabs issue of Oblivion. And the green and black was just ugly compared to the rusty neutral colors of the first two.