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.
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No there's usually still red bars because there's no region match making so people get put into matches with people from other countries that they wouldn't go into if they could. I get thrown into matches with Americans or Europeans all the time, playing from Australia with our horrible internet that we can do nothing about can be quite punishing most of the time