My experience is that 99/100 matches there is at least one red bar player.
Also from my experience i can say that one of those red bars is the host.
And the host has red bar, because everybody is playing on his connection.
Probably he has a very good ping, but too poor bandwidth for all players to play on. That's why red bars are mostly MVP's- they are hosting, so nr. 1 connection which counts.
This is the reason that after 2 years there are still red bars, every match......Bungie won't ban them, because they know it's P2P's matchmaking-system's fault.
Everybody knows that when you have very bad internet (red bar), you can't make a kill. Have tried it myself.
-
Nah not the host. The problem seems to me that one red bar produces more, as a match goes on and the data traffic gets more and more lost/delayed whatever happens to it, more and more red bars appear. Doesn't mean those red bars are lagging though, in my experience Ping is far more important in cutting down lag. The amount of laggy green bars in this game though, now that's bungies best work!