Latency happens, it is the internet. No gunfight will ever be 100% fair (on your screen).
Everyone gets the same game
So, all you can do is optimize/improve your own settings.
Your bandwidth means relatively little to gaming. Gaming uses very few MB, even when you are host. Just because someone has a 100dn/10up bandwidth does not mean they are better placed than someone with a 10dn/1up --> it just does not work that way.
Bandwidth is only advantageous to you if multiple people/devices are using your connection at the same time. Large bandwidth will help you download patches/mappacks quicker too. But, as for playing games....it does not matter.... bandwidth + speed.
In short the closer (in ping) you are to the host the better time you are going to have.
how close you are to your local telephone exchange (this is your "last mile" of internet travel)
Who you are matchmaked with. !!!!!!! (remember their are 11 other players.
How close you are to host compared to the other 11 (whether it is listen sever or dedi server)
How well is your router configured. Again, in short, the more efficient you make your router in passing data through...the better:)
You can give the following a read...
Also, for optimum gaming using an ethernet cord is always more stable/faster than Wifi. Stability is as important for your connection as speed is.
Please note that online gaming is not a perfect world.
Even with the best internet/router setup you will come across events in game that make you go WTF. Why... the nature of latency. In most occasions a player with a lower ping to host will have the slight heads up on opponents. Yet, some circumstance will give the lagger the slight advantage,,,,, latency is a double edged sword. BUT, having your router configured properly is "best".
Also, do not discount other factors that you can control. Lag can also come in the form of 'input lag'. Simply put, a gaming monitor has a lower input lag than a big screen TV. If you have a big tele, that's cool, just make sure that it is set to "game mode" which most TV's come with nowadays.