WTF? I've been playing MW3 for more than a year now and never had any problems besides the occassional lag. Last week there was an update of the system and i downloaded some DLC content and "BAM" i cannot play any hardcore games anymore.
Already did some searching on the forums and have deleted DLC 2 and 4 from my storage but still "no games found". I can now officially throw MW3 away as i can no longer play the game in multiplayer mode.
IW is not responding to my requests so i guess i'm F******d.