jarvan is better in the jungle or top right now but he's still a very strong support
granted with the most recent nerf it hit his support abilities much harder then anything else (altho it was meant to be a nerf to his utility so....yeah lol) he still brings a lot
AoE slow (not very strong but still there) tankiness without a high gold cost. armour reduction (very strong right now as well) impassable terrain, knock up, vision, strong passive. all things a support can utilize well. even in lane he makes for a very good aggressive support.