Louis Wu of HBO has written a Halo review of his own. While you might expect the man behind one of the largest Halo sites online to be a bit biased, it's actually a very honest review. Louis Wu wasn't afraid to criticize what needed to be criticized and at the same time, he praised what needed to be praised. Since we all know what's good, here's an excerpt from the review that conveys a couple of the cons of Halo:

There are some sections that feel repetitive - it's not even that you've done it before (though you have) - it's more that they just seem to go on and on... But worst for me (as minor as it might seem to some of you) was cutscene behavior. Several times during the game, you trigger a cutscene... and perspective shifts from first to third person, as the action unfolds. Unfortunately, these scenes are not really tied in to the game you're playing. Usually, the Master Chief is shown carrying his trusty AR... even if you (the player) don't have an AR in your arsenal.

This is probably one of the best reviews you can read if you want to know what Halo is really about and how it stands as the game we expect it to be. Overall, HBO scored Halo 93 out of 100.