If Jarvan gets Stunned/Snared at the start of his Q ---> E 'combo', he doesn't dash.
In a High Gold-Low Plat Ranked game today I caught a J4 right in the middle of my ultimate as Leona (a perfect ultimate right in the middle of the sweet-spot) and he just Q ---> E'd right out of it with no consequences because technically by the time his dash animation ended, the stun only had about 0.1 seconds remaining.
Mitch3ll1 votesIt's one of few "unstoppable" movement abilities in the game, right alongside Vi's ult and Malphite's ult (probably a few others I am forgetting). It's fine as is, people just need to learn to CC more important targets such as that Jinx in the back ripping up your team.
ABlueQuaker1 votesIt's also a Basic Ability with about 1/6th to 1/8th of the Cooldown of the Abilities you're referring to.
Mitch3ll1 votesAt the cost of using two abilities leaving you with only one damage ability left, especially if you miss Q E. Jarvan must use 2 abilities for the same unstoppable effect that Vi and Malphite get to have with just one. So it balances out fairly well.