Obviously the multiplayer is probably the best in the series. This is where Halo esports really took off with the balance of the game being geared completely towards Battle Rifles and power weapons. If you haven't played halo 3 local multiplayer or even online multiplayer, and you like shooters, you're completely missing out. That being said, I think the campaign is overrated. Very repetitive, and fails to achieve the best parts of Halo and Halo 2's campaigns. It doesn't have the simple fun of Halo 1 nor does it add much to the lore like Halo 2 did.