Thresh really needs buffs
I mean sure he was a monster before, but now he brings nothing to the table noteworthy other than pulls and very situational peels.
He has a terrible HP pool and a shit base armor that doesn't break even until about 30 minutes into the game unless his team is steamrolling.
- increase his base hp.
561600 (I mean really he has paper armor early he need's some kind of ability to live). - base armor
1622. 16 is pathetic starting armor and he also gets none per level and his armor is so risky to obtain - Armor/AP per soul
.75.8
These small buffs will actually give thresh a presence in lane instead of having him be Leona's ugly twin that takes 2x the skill. His damage has been gutted and that was all he had before putting him ahead of other tanky supports. Without that he just feels lackluster now and games are going shorter meaning his passive is less and less useful.
They have nerfed his range as well as animations several times as well. I mean he needs something. I run him full tank runes and masteries and he still dies easily.
I mean if you want pulls, you bring Blitz. If you want dives, you bring Leona. Peels are supposed to be Thresh's strong point but he does so much worse than Leona because he is squishier and harder to play. Even a good Blitz can peel harder than Thresh.
Peel/Engages
Hard Peel
Engages and damage
Picks 
Thesh is the awkward middle ground that actually turns out pretty weak. He has no room to carry. He has a terrible early game unless he is fighting a lane that doesn't counter him (the majority of them do).
People that counter thresh because they outclass him:

All of them are better. Thresh only brings utility to a damage fight bot lane. And that doesn't cut it especially when he has nothing to defend himself.
He has a 47% win rate and a 1% ban rate. I mean he obviously isn't strong enough to warrant bans very often as much as people sit their and complain about his lantern. I mean Kalista has Thresh's lantern 2.0.
