well, there are different types of power level based on a comic's scope.
Street level heroes are normally those with either no superpowers or minor ones, they deal with street thugs, gangs, mobs etc (example. Punisher, Daredevil, etc)
Global Level heroes are the ones dealing with major threats to the world and They have medium level superpowers or use fancy gadgets (example. Iron man, Captain America)
Cosmic level heroes deals with threats to the galaxy. They are virtually gods and have power beyond anything mortals can achieve (example. The Sentry, Thor, Silver Surfer)