loved him in 1

Not as OP as you would think...there are items to build around his passive

you talk a lot

He's mostly good because of his laning and his ult reset id'say, his passive is Ok.

I dont think flat armor is a big deal past mid game.

not when i use him....

Prots don't actually do a ton for survivability, especially not the small amount achilles gains from his passive. Sure it's a nice bonus, but any amount of penetration will shred right through 45 of both prots.

well he gets prots and bonus health, it's a decent combo

While it is a nice boost, it doesn't really do that much with his kit. He's been a better jungler because items are a lot more focused around synergy.
In addition passives don't count as "from items" so you're losing out on everything cool you would usually get from these stats while still getting shredded by any competent carry later on.

Just being tanky isn't a viable strategy anymore because you can't be and hybrid builds are in a rough spot.