Mordekaiser is overrated.
I have fought him many times in the top lane. And i can say i have destroyed him almost every game.
Mordekaiser is a strong laner comparable to
and
. So you must play a strong lane duelist in return like
or
. Of course Morde will dumster on someone like
. Thats what lane bullies are for.
My personal favorite counterpick is
, you can out duel him even in his ult. I once made a morde go AFK after solo killing him in lane 3 times. Once you kill him once you can kill him over and over again.
So do your best to punish him once he misses his pull or Q, then all in him. If youre in a somewhat unfavourable position, just keep your distance. I know it is easier said than done, but he has his weaknesses just like everyone else
Maybe Im biased because I dont play an ADC that fears the ult, but really he is not as powerful as people think.