Finally a group of people who actually know what they're talking about with halo.
I may just have to get on my actual computer to type longer paragraphs of information.
Prime, of all the games I've ever played, I'd give Halo 3: ODST a 8.5, with Reach at about a 8.8. So I recommend it. And The picture is of The Brute Chieften from Halo Wars, which featured terrific art work and animation. It also introduced new vehicles (non-canon) that were very awesome. Like the Grizzly or Vulture, which I want in Canon Halo so bad, I would be okay if they were the only vehicles.
If you have any questions at all, just ask me because I'm well traversed in the halo universe which has a lot less grey in it then A/P/AvP