IMO FO3 goes to great lengths to support both gameplay and a [skewed] world setting that have little or nothing to do with the Fallout series; and in many instance presents a direct 'about face' to core the precepts and what made Fallout and Fallout 2 so great; (like having to accept being vilified for one's actions).
*That said... I think FO3 had incredible art & design in it; it presented its own ~albeit anachronistic view of what the Fallout world could have looked like after the war... but [strangely] it was set 200 years later and all progress from the prior series was ignored, and there was no way to respect the inhabitants anymore... where before they were striving to recover ~in FO3 they lived in squalor ~liked it; and maintained it indefinitely. IMO this was absurd, and very un-Fallout-like. Take the Citadel for instance. In Fallout 1 the BOS bunker was spotless; in FO3 they lived in a trash heap ~when it would (of course) be expected that they would have had the Pentagon livable within a week and presentable within a month.
Game-wise (as per topic) I think it was a good and easy game, but a poor example of the Fallout series.
*(It didn't have to be though... It's clear that the project had all of the potential for it; and then some, but IMO that's not what we got.)