Louis Wu at HBO noted that PlanetXbox has posted a hands-on review of Halo. They were particularly impressed by the size and detail of Halo's environments:

The levels take place in a variety of massive environments, both indoor and outdoor. You start the game on your own ship, and once on Halo, you'll traverse mountains, valleys, and beaches, as well as heading indoors to various Covenant structures. The engine does a good job of rendering both in great detail, and handles transitions from one area to another seamlessly. We were particularly impressed by one scene set in a snowy mountain region, where you need to make you way to the top of a huge structure -- there is a definite sense of scale, and it's easy to overwhelmed by the size of things.

There are a couple of minor inaccuracies: they're referring to the game as Halo: Combat Evolved , got the timeline a little messed up, and said that multiplayer can connect up to 16 Xboxes -- which doesn't tell the whole picture, as that might seem to indicate a player limit of 64 if each box uses splitscreen mode; when the real limit is 16 players.

UPDATE: Djof noticed in the HBO forum that this is actually a repackage of the same article from GameSpy last week.