GamesRadar is pretty unqeuivocal in its praise. If you're asking if Halo 3 is good, or as good as they say...

The answer to both is yes - a huge and resounding yes. Every type of Halo fan, from the hardcore to the casual to the brand new, will find something to satisfy them in Master Chief's third adventure. Rest assured that no matter what you expect out of this series - epic single player, massive multiplayer, insane coop, robust community and editing tools - you will not be disappointed. Halo 3 is an overwhelming success.

Final score: 10 out of 10 from GamesRadar.