Three (make that five) more Halo reviews today, courtesy of Shacknews: Boomtown, Entertainment Depot, and Adrenaline Vault.
Boomtown gave it an 8, respecting everything good about Halo, but doubting the title's appeal on the PC without more new content. Entertainment Depot also gave it an 8 (excellent), with the only subpar mark for 2-year-old graphics. Adrenaline Vault gave it 4.5 stars out of 5, hoping it sells well enough to justify porting Halo 2 to the PC as well.
UPDATE: Two more, these found at Blue's News: Gameplanet NZ (did we mention that one before?) and Gaming Illustrated.