Halo: Reach, Halo 3, Halo: ODST, All I play [Fullstop!]
If you want something different from Bungie, I HIGHLY recommend you get it. It's so much more different, but a good different if you get what I mean.
Instead of running around in a clear path, you gotta roam around a city to find past items from your ODST Team and do the mission how that item got there (Flashback)
It's so much cooler than saving a gigantic ring or planet from the covenant :P
So, I say go for it! It should be VERY cheap to buy now :')