HardcoreModz
Good news, soldiers: The multiplayer component of Call of Duty: Modern Warfare 3 has received its sixth title update since the game's launch; a patch which addresses lag and a number of glitches players have been exploiting for their own nefarious, personal gain. Gone are the days of melee-jumping, as well as clan tags which use the controller's symbols to spell dirty words. (Bal[LS] indeed, sir.) A number of guns have also been tweaked (see: nerfed) as hotfixes introduced to the title. You can check out a full list of these readjusted armaments after the jump, and pray that your precious, precious firearm evaded the developers' all-seeing eye. Title update: Additional improvements to address lag. Fix for Melee Jump. Clan Tag Validation (remove buttons from clan tags). Improve Host Migration logic. Prevent stat loss when player loses connection from server (internet pull / drop).
Hot Fix Updates
Fire rate normalization for Assault Rifles with undermounts
FMG9 Re-balancing (Nerf)
Akimbo FMG9 Re-balancing (Nerf)
Fix for Shotgun's with Extended Mags (Prevents them from shooting more pellets than intended)
Type95 Re-balancing (Nerf) - Reduce hipspread.
Fix for ACR with Red Dot / Shotgun
Fix Type 95 bug related to dropping it.
Fix map exploits on Dome
Source: http://www.joystiq.com/2011/12/12/modern-warfare-3-update-addresses-lag-certain-glitches/#
