It's still not something that should be left alone. I bought this for XBL Co-Op - something I couldn't do before. I'm sure others are in the same boat.. It can't just be ignored.
Pfft, are you kidding? The lag on co-op play over Xbox Live needs to be fixed. This is ridiculous. It's not my connection, the Reach engine runs just fine as does every other game. Ugh, it's unbearable.