That's prettymuch the opposite of what it did. 5e greatly increased the raw power of most classes, all the casters have far more, more powerful, and much more versatile spellcasting. The few non-casters do a terrific amount of damage, even if they do little else. It's not quite all the way back up to 3.5 levels with Tier 1 CoDzillas breathing radioactive fire, of course...The main 'issue' with modelling superheroes with 5e is that 5e's design deliberately steers away from high-powered gaming.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.