I think it's pretty obvious that Fallout 3 is quite a departure from the previous two games. Just take any two screenshots from those games, and it should be patently obvious.
Fallout 3 has the same mature type content as the early fallouts, the same role-play type of game with character development via stats and perks, survival combat, exploration and the type of interactions that the early Fallouts had and the same type of scenario ... the
core of Fallout, and of course a story line being slightly different in each case, as it should be.
Each of the series made changes in game-play from the previous, but always kept the
core of Fallout, as did this last one, Fallout 3.
That there may be variations in how each basic core part is executed, or may not be
exactly the same, does not negate the core of Fallout.
True there have been changes in graphics and viewpoints, but the core is still the same, stats and perks being at variance, the core still remains true, or that interactions may be a bit different, the Fallout core is still true.
Same with exploration, the graphics difference between now and early Fallouts being quite pronounced considering the time-gap difference, that does not change the Fallout core, nor does the core change because the player's choice of viewpoints are extended.
That survival combat may be executed a bit differently from the previous, that does not change the Fallout core, it does
not have to be
exactly the same execution of combat as it was previously to hold true to the core of Fallout. VATS still remains, slightly different, but still in keeping with the core of Fallout.
The imposed turn-base method of combat has been dropped as it should be, and is now left to the player to self-impose a variation of turn-base play of shoot and move, themselves. There is now a choice which is a good thing, it's not
exactly the same, but the core of Fallout still remains true.
All the changes and alterations of execution of play in Fallout 3 (that some have been griping about) , are changes that have not altered the core of the Fallout game. As I play this latest version, 3, the core game-play and experience of play, holds true.
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A suggestion of what I would like to see in Fallout 4 is to NOT have the imposed turn-base combat as of old, were that to be considered, there is no justification for such an imposition.