He was perfectly fine how he was.
He was statistically one of the worst tanks and champions in the entire game.
Now that his W has no shield as it casts he can no longer make good outplays and is useless in early game fights.
It's definitely harder to survive in fights and harder to make good trades but Unstoppable is a very strong mechanic when used correctly. I personally don't like this change but it doesn't make Ornn's rework bad.
The knock up on his ult is now 0.5 seconds for any player that is after the first? Are you kidding?
It does decent damage and it's still one of the strongest teamfighting ultimates in the game. His ultimate had to take a hit because it was holding the rest of his kit back.
But that basically just makes him the teams b*tch.
In what way is supporting your team a bad thing? How does it make you a bitch to play a helpful champion? He's more useful overall now.
Only useful for his passive at lvl 14 makes him a lot harder than he should be.
His passive is better now considering you don't have to shell out an extra 500-1,000+ gold for an item with moderately increased stats. Most players barely got around to buying the items because building towards another was more efficient.
Ornn still has his strengths and his power was shifted. Let's give it more than a few days before we cast judgment, alright?