...almost. Demand for the service the day of Halo 3's launch stressed the system to its limits, making it slow or inaccessible for many, according to Next-Generation.

Microsoft labelled Halo 3's launch day as the "most active Xbox Live gaming day in history" after more than a million people had been logged playing Halo 3 online. That may be the case, but there were many others who weren't able to get in on the action.

I'm betting that any part of those problems that isn't solved yet, will be soon; XBL play is too much a part of Microsoft's plans for the platform in general and for Halo 3 in specific for them to continue for long.