Fantastic sound and near-unlimited replay value figure highly in PlanetXbox's review of Halo 3, but the story gets a shout-out, too:

Lucky for gamers Bungie gives everyone the chance to finish that fight in Halo 3, this is the epic conclusion everyone has been waiting for and no storyline tidbits will be left unanswered; no cliffhangers here. When the end credits roll for Halo 3 you will know there is nothing left, this is the end of the series.

In short the plot of Halo 3 is up there with both of it’s predecessors and on some levels is one of the best storylines seen outside of a Japanese RPG.

PlanetXbox gives Halo 3 a score of 9.8 points out of 10.