User blog comment:Hardly a Notion/Jax/@comment-4344970-20111013020440

Don't let him reach lategame. Make his laning phase miserable. If he can't get farm or kills he isn't much of a threat, like any other champ, but this especially applies to Jax because his lategame is monstrous, so letting the game drag on is typically not a good idea when you are fighting a Jax.

And yes he's very OP in 3v3, in Summoner's Rift it's a different story.