Ohmwrecker is the worst item in the game. Don't trap yourself buying it.
I'll make this quick and simple, if I wanted to start a Youtube League channel and make troll videos in bronze games then I would purchase this trap item.
Stats are bad.
Active and passive is horrible from start and progressively gets worse and worse.
It is expensive and by the time you get it, you can naturally tank the tower without even having to buy Ohmwrecker in the first place.
"Oh but you can reset turret aggro is that not good or are you bronze? lol" NO! There are better tank items that can do the job with better stats that carry you far to later stages in the game. There has never been an Ohmwrecker in my diamond games and I'm pretty sure it's still a nonexistent item in masters and challenger.
This item works against you. Please buff this item or change it completely, Riot.