Why all people are assuming that his new ability is like Fizz one? You will still be able to stun him, slow him, deal damage to him via abilities. He only dodges AUTOATTACKS, because that's what DODGE does.
Also people are complaining like if this ability is the only thing on him changed. Riot stated that "For more information on the mechanics of the full Jax’s remake, stay tuned for a Jax Champion Spotlight in the coming days!" meaning that the other abilities and stats probably are gonna get adjusted (via buffs and nerfs).
This community whines too much