What do I want brought back from Fallout 3?
Nothing- I look forward (hopefully) to a future in which Fallout fans refer to Fallout 3 the way Highlander fans refer to Highlander 2.

The skill leveling system from Oblivion. Gaining master skills by practicing the respective skill over time. :read: :flamethrower: :gun:
/wrists
What I'd like to see brought back is everyone from Black Isle who can get along- them handed total control, and Bethesda's grubby clown paws off my Fallout. No more Behemoths, carebear Brotherhood of Steel wannabes,
Optimus Liberty Prime, Broken
Endings Steel, unnecessary level cap raises destroying what
little sensibility the system had to begin with...
And I want the two most important VATS targets back: Eyes and Groin. Ah, good times sledgehammering Raiders in the groin. This "FORE" nonsense in New Vegas is a cheap substitute.