Hard to say, i feel like it depends on how strong he is after 15 stacks. I feel like his kit is more suitable against melee than jaina's. But i dont see much indication that we'll leave a tass meta anytime soon and yeah he looks weak to that. Think he'd be a great pick against arthas
One thing he has that other mages dont is global pressure, his kit is kind of ass for splitpushing (i dunno his talents, maybe he has stuff that helps this?), but he can soak and followup hunts and vps accross the map which might be strong. It's got a 15 sec cd lol, so every 2 storm bolts the target is gonna eat a lich nuke from across the map