Treyarch has issued news on fixes for the PS3 version of "The biggest entertainment launch in history" of Black Ops.Here's the official line on what's coming up:
* - Improved matchmaking to find matches faster
* - Improved match and host selection; will result in much better networking conditions for all games (a.k.a., decreased lag)
* - Weekly and Monthly leaderboards stats reporting incorrectly for kills, deaths and assists (All Time leaderboard not affected by this)
* - Additional improvements to party system.
Source:
COD forum