More or less at random I happened upon The First Hour blog, which reviews only the first hour of a video game. Game #12, reviewed back in September 2007 (just in time for Halo 3 to come out) was the original Halo.

As an extension to that blog, Beyond The First Hour reviews games after they are finished, and that blog features a review of Halo 3. No love for Halo 2 apparently, but that's par for the course now, isn't it?