Fallout 2 didn't improve upon the first game enough, in my opinion. It seemed exactly like the first but only with a different storyline. It was like the developers had hit a goldmine with F1 and they wanted to repeat that success, but they didn't want to risk anything so they changed nothing. It's for that reason that I'm not so critical of some of the changes being made. As long as they are remaining true to the Fallout universe, as they say, then I will not pass judgment until I see the final product.
I also loved Fallout for the detail the developers put into all of the scenes. As long as the same care is put into the F3 graphics I'll be happy.