After playing on the PBE I can say I don't like Morde only being a bot laner.
I've seen more and more people try him out mid and it doesn't work. Maybe they are people who don't really know him like i do which is why i just logged onto the PBE right now to test mid Morde myself (hopefully) but forcing him bot is the wrong idea.
Allowing him to curse other things like dragon and buffs is something that Riot hit right on the head but just forcing him bot lane is a bad idea for Morde fans.
Why kill his lovers so you can help his haters?