"BOO-HOO, I got kicked again, community is horrible!" - Noobs, here is the reason why you get kicked.
The reason why all you whiny noobs get kicked is because you endanger the whole team.
Here's a perfect example from one of my matches today:
Dead Center, Hotel.
We all know the smoker spot under the ledge, at least the players with some experience. Everybody went into the first room, the one with the fire. Except for the noob, of course. And of course he gets smoked down, hangs from the edge.
One person tries to help him, gets jockeyed off the edge. I try to help them, get charged off the ledge, instant kill.
All that trouble is completely unnecessary, if that noob had listened for the smoker, or listened to us, or just had followed us through the fire room.
Next time somebody gets to hang from the ledge because of his own stupidity - I'm not gonna help them up anymore.
And that's just one of many, many examples of blatant idiotism, sprinkled with arrogance and a "lol, it's just a game, dude!"-attitude, which just kills the gameplay in L4D2, since you are depending on your team.
Noobs who wander off, who hang back, who just run away after you helped them up and get charged or smoked in the process, noobs who let a hunter go to town on your for 10 seconds before even trying to help you, noob who are oblivious to their surroundings and don't listen for special infected noises,etc.,etc.
This list could go on and on and on. And that's just the survivor team, where you can forgive little mistakes, except for those things like the ledge in the hotel.
Playing noobish as special infected affects the whole team.
If you are the Boomer, everybody is waiting for you to iniate the attack, and you just stand there and have no idea what to do - don't be surprised if a kickvote comes up immediately.
If you don't spawn out of ghost mode at the very last moment you are giving away your position - another thing that makes your infected absolutely useless, and will people want to get you kicked.
People like this I encounter all the time. Less than 10 hours played, but playing Versus. They get you killed as survivor if you try to help them out of the ♥♥♥♥ they got themselves into, and they are absolutely useless as special infected, attacking by themselves and doing about zero damage.
Nobody gets kicked for no reason at all, and all you noobs are whining here on the forums because you don't even understand the game well enough to realize what mistake you made.
Seriously, play single player, play campaign, and don't get your noob butt into a Versus match until you are a reliable teammate as survivor.