This is a guide I put together of my my experience from my 5 matches using Nightmare Superman. He is a very squishy Controller but if you can build him with strong power damage and high cooldown reduction than he can easily go 1v1 with most champs except for Enforcers, they gave me lots of trouble still.

You definetly want to get Abun Sur's Lantern to level 2 so you can build up that Will Battery cause Nightmare Superman has a passive Will Bonus he gets for some skills which will help you later in game.

Now what you will see is that I recommend leveling his Ultimate last, this is cause it only holds one enemy down for a little over a second, but doesn't do any damage so thats why I save it for last. 

Now his Vortex skill is very good for laning against drones, and helping get away or pulling back an enemy. 

Siphon-Infuse is also good for helping you prolong how long you can stay in a lane before having to return to base to heal. 

His Phantom collector is good for weaking the enemy so you can poke champs harder with your skills, but make you get the line up correct or you could miss it. 

Normally you want to stay with a team mate if you can, but if you are careful and cautious you can play Nightmare Superman as a solo laner as long as you are only facing one enemy.