Halo 3: ODST will only be released on the Xbox 360. The are currently no plans to make Halo 3 or Halo 3: ODST available on any other console other than Xbox 360.
you cannot fly the pelican in any halo game so far. (Other than Halo Custom Edition)
from games I've played so far... yes
All Halo games are Microsoft products. Nintendo and Sony are competitors with Microsoft, so it is unlikely that you will see a Halo game for any other console than XBox/XBox360/etc. for the foreseeable future.
Yes. By a long shot. No the Halo Reach is only available for the Xbox 360. How could a game with limited availability be better than a game available on Multiple Platforms that has outsold it even on it's exclusive platform.
No
Halo is better. For many Reasons. 1. Halo has much better music 2. Halo has a cooler name 3. Halo is an actual video game 4. I am very good at halo 5. Halo has better graphics than the Fray 6. Halo has better sound than the Fray 7. Halo has better gameplay than the Fray 8. The Fray doesn't have any enemies and many many other reasons.
Halo's Rubbish, But The First One Was Okay... So In Short No
There has been no official anouncement of a "Halo 4" However there is another Halo Trillogy in the works being developed by someone other than bungie.
Someone can choose not to boot you, or the system sees it as an obvious accident, and it is looked over. Other than that, just try not to kill your teammates.
yes there is much more to do than halo 3
Yes, If you read the books you can tell. There were hundreds of others. There are also Spartans in Halo: Reach.