Jarvan Ult Update

How come we can make galios ult unaffected by tenacity, make veigers stun impossible to move through unless you have a flash or essence flux yet when it comes to Jarvan, an ultimate is easy to walk out of. Vayne tumble, cait 50 caliber net, heck any dash or re-directional move (which lets face it Riot doesn't introduce a new champ unless it has some sort of mobility) can easily leave the ult. I understand the Galio change due to him being low in popularity but jarvans ult is designed in the same way for containment so why is his a speed bump rather then an actual crater? With most of the champs, especially those in high popularity J4's ult is nothing more then a novelty and unless your against champs from pre season 3 or you build full damage and one shot someone you generally find yourself sitting alone in your own "containment" ult. Which is sad when you consider it's a high CD aoe ULTIMATE and yet veigers stun has been reworked for no escape and it's on a ~15 second cooldown. There doesn't need to be increased damage, increased size, lowered cooldown, as I believe all those aspects are balanced, but when the ultimate description even states it's an impassible terrain, well that's just a joke. If his "impassible" terrain is really impassible then riot either messed up in working his ult or someone messed up in writing the description.