Don't let the lore fool you, Volibear is no Demigod
Nothing had made this more apparent than the release of Ornn. Specifically, his skin. Take one look at it, and it's immediately obvious that he's every bit the Thunderlord that Volibear should have been. His kit was beautifly done, and the skin was implemented in such a nice way. Belching thunder clouds, headbutting a lightning elemental, electric explosions that knock up enemies, conjuring electricly charged terrain. What does Volibear have in comparison?
A raspy cough that scales with a stat you will never build.
A slow telegraphed single target cc spell that is impressive in name only. It doesn't even scale with anything besides levels. Rolling Thunder? More like Rolling Blunder.
An attack speed buff which does very little for him for two simple reasons.
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It's next to meaningless against squishies. 90% of the time you will attempt to dive them and burst them down with a few autos into your W. If you cannot pull this off, they will simply kite you out and outsustain the pitiful 30 damage you do per AA with their 1 lifesteal item.
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Against tanks it's basically non existent because Voli does only flat damage. Armor and MR make his damage output non-existant. Sure it enables him to slap you a few more times with his ult, but an extra 200 odd damage is pretty negligible to a full tank sion.
A bite that is actually pretty threatening, but a simple Janna shield or summoner heal is enough to remove this threat entirely.
And finally, the feast de resistance. The ult itself. The reason why Ornn warns his team to "Seek Shelter" whenever Volibear is around... His Ult.
Behold... A whopping 155 damage on hit at rank three!
Why is this here? The AoE element to this is negligible at best. It's already been established that Volibear tickles tanks, so hitting their frontline to proc this isn't exactly the best way to be useful, especially compared to the enemy Gnar or Sej who can Stun lock your entire team.
It helps you bring squishies low just a bit easier so you can execute them with W, but even here it actively works against you because the cast time on this ability stuns you in place and often allows the target to slip away from you. You can attempt to cast it before going in, but anyone with a brain knows that the instant Volibear suppresses himself with this ability, it's time to slowly meander away to avoid the oh so threatening extra wits end he now has to slowly maul you with.
He may be Ornn's brother, and therefore an immortal demigod, but when you compare the two. One is an impressive, epic, beautifly designed champion with tons of potential. The other... is a simple one dimensional wreck of a champion that has always struggled to find a niche for himself. Even when the meta shifts to favor champions like him, he always finds himself outclassed. A champion like him really has no business being in the same league as Ornn in his current state.