GameDaily ranks Halo 3 pretty highly, giving it points for improving on its predecessors:

Halo 3's single-player adventure surpasses its prequels by combining the best elements from the previous games. Like to the original Halo, this action unfolds in varied large-scale environments, and like Halo 2, Master Chief can board enemy vehicles and toss off their drivers. Though the environments are larger than before, Halo 3 still doesn't qualify as a free-roaming sandbox game - once you move into an new area, there's generally no turning back. Even so, the game lets you tackle missions in various ways, sniping enemies from afar, flanking them on either side or simply running them over with a vehicle of choice.

GameDaily gave Halo 3 a score of 9 out of 10.