Invis Champs and Low Elo

This is getting on my nerves. Eve, Shaco, and Twitch just auto win when I'm against them because everyone likes to roam around with low health, roam alone or forget that there is a twitch on the enemy team while fighting a "4" v 5 and using their CC/Dashes/Ults on Tanks or less important targets. What are some good ways to deal with this? I should try pinging and chatting more often.. Common sense against these champs isn't so common.