I have never once intentionally banned a teammates intended pick.

I have a cpl times when I saw someone was gonna ban my pick(I waited for them to lock in the ban first) and then was like "Ok, so you wanna play it that way. I can do that too." But yeah, it's something you shouldn't really do even if you don't really like their champ as it's not really good a idea to get teammates tilting in champ select.

That being said I had a teammate picked Jungle Ornn in RANKED just last night. He did HORRIBLY. He ended up feeding and feeding, we told him not to gank because all his "ganks" would just end up in the enemy easily killing him. He ended up going like 2/13 and the only reason we won that game was because the enemy Mordekaiser who he fed and was wreking face went AFK and even then it was an uphill battle with 4v5. Personally I don't think it might just be so much the champ himself but that since he's new, very few people really know how to play him.

But yeah after that, for the next week or so my new policy is if I'm playing ranked and teammate picks Ornn, I'm banning him. After that next week or so, I'm looking up their history and if I don't see some good Ornn games in there, I'm banning him.

I'm fine if it's normals but it's hard enough to climb as it is. I don't need people taking him to fuck up my ranked games even more.