Originally Posted by Mambazo
Play with friends... most pub stomp champs are champs that take advantage of poor communication on the enemy team. Warding and communicating among your team will shut these champs down.
This is 100% correct. Wards will save lives. I know, especially early on, that they may seem useless, but try playing a support role, getting like 3 GP10 items, and warding everywhere.
Tips for when you're doin not so great.
1. Tell everyone to play as defensive as possible
2. Ward major locations and make sure you don't get ganked too often
3. Try to communicate your own ganks on weaker members of the other team.
4. If you're really desperate, get Gold per 10 seconds items. Seriously. Stall. This'll work especially if their fed player's inventory is maxed and he can't buy anything more. They'll stay the same strength and you can get stronger.