[{quoted}](name=Ahri Lover Rock,realm=NA,application-id=3ErqAdtq,discussion-id=8ccLkxck,comment-id=00000000,timestamp=2017-12-03T22:12:14.146+0000)
Uh...?
He was hot garbage almost the entirety of season 6 because poke damage is useless when it gets shielded/healed up. The only other thing he brought to the table is a weak stun and that's clearly not enough to be a good champion in a meta like that. r u ok?
Not too okay... kind of frustrated of what Riot did to Ahri. Well back to the point.
He has the ability to stay in lane for a very long time due to his passive, and now the sorcery runes gives him even more power in lane.
What made Xerath... Xerath is his ability to participate in teamfights with his huge range. He also has amazing scaling while having great mid game as well.
Xerath does indeed bring huge amount of poke damage, but in lane of midlane, there aren't many champs that can heal the damage taken through pokes like Ahri(though one of her lowest winrate in midlane is actually Xerath according to stats), in fact her lowest winrate is from Xerath with 46.1% winrate.
https://lolalytics.com/ranked/worldwide/platinum/plus/champion/Ahri/
So, in lane he was already quite strong, and even safe because of his passive and long range poke and wave clear potential.
Xerath is definetly better, I am not denying that, but to say he was not a champ before is quite a stretch for a champ who has a lot of damage and strengths with very little weakness.