I am surprised that Renekton isn't popular
Seriously, even at the time that he was popular and considered to be very strong, he has never been nerfed. He was actually very buffed and I predict that once people realize how strong he is now, Renekton will suffer from the same problem that Vayne has: She is strong now because she was buffed over the time and when people realized it was too late.
Here are some of the buffs that Renekton received:
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Q changes: Now his heal can't be reduced by the enemy's armor because it is not based on the damage that Renekton is doing. So even if you buy armor against him, he can still outsustain you.
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He can generate more fury than before.
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A former core item for Renekton,
, has been reworked. It now offers 20% CDR, and Renekton love it since he is a caster. The other changes benefit him too, namely the Rage passive and the extra HP. -
- This item is even better than
for Renekton due to the fact that he will be stacking a lot of HP and its passive is an on-hit effect that Renekton's W can proc 3 times at once. Not to mention his ult. The only thing that Titanic Hydra lacks in comparison to Ravenous Hydra is lifesteal, but Renekton already has a heal on his Q. -

Most of the changes that Renekton had were mostly itemization changes. Still, I am surprised to see that Renekton is not popular once again - he is ridiculously strong right now.