in pervious call of duties the host had an advantage beause he had the best connection due to the fact that listen servers or P2P connections the host is hosting the game and playing it on the same system. however  mw3 now picks host based on wost connection type thus when lag comp kicks it, it causes the lag from the other players to affect the host as well as anyplayer that has a decent connection to the host. host advantage is only an issue with P2P connections, and usually isn't noticable unless the ping difference between host and the other players is sufficant like it is on xbox and ps3 connections due to the data having to make additional jumps before making its way to the host or player. a host advantage of .05 seconds is hardly noticable as if it were a host advantage of say .2 second. now host advantage was never an issue for pc players up intill mw2 where iw thought it would be better to have pc players deal with the not effective p2p matchmaking instead of letting us use dedicated servers which while cost more to run don't have factors like host advantage and exessive lag comp as high latancy based issues usually at limited to only the players with the high ping.

.05 second would be equvilant to that of 50 ms ping and .2 would be 200ms ping.

30 to 100 milliseconds — typical minimum latency for a broadband internet connection (important for online gaming)