This has been going on for a week now. MW3 lags like crazy. Constantly have 4 bars however it'll run but get that moment of lag where you freeze for a second and continue. Really really annoying. MW2 doesn't do it, my 360 doesn't do it. Tried a PS3 wired and wireless. Right now I'm on my MacBook Pro about 100ft away from my Wireless N router and I'm getting 21Mbps DL and 2.08Mbps upload.