Well we got ODST, tried to play the campaign amd got the cannot read disc error. We did what the box said to do (clean disc and restart machine) but to no avail. We exchanged disc and had same problem. So I got on bungie.net and found out A LOT of people are having the same problem and that it even spread to their halo 3 disc. Since I didn't see a definitive answer about a fix on the forums we went and got our money back. IF/WHEN they get it fixed I guess we will get it. Was pretty excited about playing new campaign and getting new maps for H3, but now we are out both since maps are only available to ODST owners.
We did pick up DIRT 2 I guess in place of ODST, it's seems to be ok so far, although they really dumbed it down to almost an arcade game. I wish they hadn't done that. I think companies over think things and change way to much between games. They did the same for Marvel UA 2. Don't get me wrong I like the game, but I miss being able to pick from 4 different suits and pick my own powers, I think they focused too much on the somewhat new fusions. It's basically a changed special power. I also do miss picking up gear as well. The new team bonuses are nice but there are so many of them kind of overloaded. The story is pretty good though and it is a lot of fun other than the things I've mentioned, it's a pretty good follow-up.
I'm now excited for Forza 3 to come out..can't wait!