I hope Riot is ready to hotfix Mordekaiser after 5.18

See the link for the Mordekaiser changes currently on the PBE. There are a bunch of changes, but I'd be surprised if they amounted to anything more than a modest nerf for ADC Mordekaiser; chime in if you think otherwise.

In Gold+, Mordekaiser's winrate is currently 63% at ADC and 45% or worse at all other positions. See here for the stats. Also note that 63% was roughly Skarner's winrate when Riot admitted he was absurdly broken. Although I have multiple concerns with Mordekaiser's current kit (in particular, the 9x multiplier on Q damage at max rank), I think it's fair to say that the large disparity between the ADC and "other" winrates stems from the huge experience buff via the W passive. In my opinion, such an ability simply should not exist in League of Legends, except perhaps as a much smaller bonus (e.g., Zilean's "8% increased experience" passive). It's not at all unrealistic for Mordekaiser to hit level 6 before the opposing ADC hits level 5, even without serious mistakes by either side.

The reason I'm really concerned about this is that 5.18 is supposed to be the Worlds patch. I trust them to eventually realize that the Mordekaiser rework is a hot mess (and to fix it), but I'm really not looking forward to watching the culminating event of 2015 pro play with Mordekaiser as a mandatory red-side ban. He's probably not as broken in pro play since those players are better at kiting, but I have a hard time believing that a champion can be 63% in a position in solo queue and not a top pro pick. (Also, if you jump over to probuilds.net, you'll see that a lot of top ADC's such as Rekkles, Imp, and Deft are spamming him.)

So, I really hope that Riot has a hotfix (hotnerf) ready within the first week after 5.18 so that Mordekaiser doesn't turn into 2015's Alistar (the mandatory red-side ban from 2014 for those who weren't watching).

EDIT: It seems that the logic for assigning Mordekaiser as an ADC is flawed; see here. To be honest, I still have the same concerns about his kit, but at least it seems he doesn't actually have a 63% winrate. He's probably still a bit broken, though, since his overall winrate is 54%, meaning that the actual ADC winrate is somewhere in the range 54-63%. Flash+Heal Mordekaiser has a 59% winrate, which may be a more accurate gauge of ADC Mordekaiser's strength (since most Flash+Heal Mordekaisers will be ADC.)