Renekton is one of those champions that are pretty much allowed to dominate in something, regardless of meta.
The top laner that ALWAYS will dominate top, he will beat you early. Riot commands it.
Hands down, the best. He has always been the best jungler, no matter the season and no matter the meta.
The best AD assassin, hands down. Then again, you have to choose between Zed and Talon as an AD assassin so . . . yeah . . . but he is always allowed to be available in a ridiculous state of power.
If you look at the meta and how it luxuriates, all of the changes are irrelivent and do not have any effect on these champions, for example:
: She comes and goes, she is either "OP" or either "UP" and is picked or not picked at all. This status is determined by her kit being nerfed + buffed.
Comes and goes, he has been out of comission lately because of how easy it really is to remove Mundo from regenerating his HP, one AD item completely removes his ultimate- then you have morel that most mid mages + AP assasins build it for the mana and CDR as well as the high value of AP.
Comes and goes, he has just been hit hard and is not longer competing as top tier- read the patch notes.
Again, Riot simply favors these champions. All of the favored champions:
These champions are never nerfed to the point that they have reached a state of being unplayable in competitive, like most champions have been in that type of state before. Their kits are overloaded. The biggest problem is that these champions fit into EVERY team composition, pretty much. Like Elise, except Riot doesn't like Elise.