Jarvan feels bad since Juggernaut era.
His last buff was in Patch 6.5 W - Golden Aegis COOLDOWN 20/18/16/14/12 seconds ⇒ 12 seconds at all ranks R - Cataclysm COST 100/125/150 mana ⇒ 100 mana YOU'RE STUCK IN HERE WITH ME Now deals damage to all targets trapped inside the Cataclysm
Right after this buff Jarvan LOST tons of players because he felt weak both top and jungle. Now he is sitting at ~2.5% pickrate (prebuff ~8%). His clear is pretty bad and you get way too low than you should. His top lane just gets overpowered by tanks he can't really burst, or stronger bruisers with higher base dmg.
Also can you give his ult guaranteed dmg on initial target? Looking how well timed dash or flash can now negate whole dmg while running away from walls just feels terrible.
(when behind)
(when neutral)
(when snowballing)