Did tahm kench get nerfed to hard

I picked up Tahm mid december 2015 and really enjoyed playing him. Not gonna lie though, he was op as fuck. I think the first set of nerfs to his ult and his w in 6.2 we're good nerfs because they got rid of some of his ridiculous damage for someone who only stack tank items. The nerfs on 6.3 and 6.4 however, i think went a little to far. Tahm was sitting at about a 51% win rate before his initial nerfs and a huge ban rate of +80%. After the most recent nerfs hes sitting at about 45% win rate which is one of lowest in the game. I still can't play him very often because people still ban him 44% of the time even though play rate and win rate are down. When i do get into games with him it's very difficult to win lane now because of the Q (tongue lash) hit box changes and the stack decay is very fast now. Tahm's pre 6 was already bad before the nerfs and could be abused, but after the Q nerfs, it's significantly weaker. His level 6 power spike also took a big hit now that the passive damage is basically halved.

tl:dr i don't think he should've been nerfed that badly (still needed nerfs though) and the community should learn to play around him instead of making lots of posts about Tahm needing nerfs.