A reskin of Elder Scrolls: Oblivion that is an attempt at continuing the Fallout series.
While a good game in itself, the general consensus is that it DOES NOT adequately continue the Fallout game series, due to the lack of turn-based combat, humor, slight lack of continuity with the rest of the game series. It is also less of a free roam than the previous games, and has a much darker theme.
Positive aspects in relation to the rest of the series include making certain popular aspects of the other games 3-d and life-like (ghouls, super-mutants, brahmin, power armor)
An example of one of the continuity erros in Fallout 3 is that Vault-tec's headquarters was in the DC area, while in the previous games it was established that it was in in the west coast area.