They wouldnt be in league with most the guys in DC. Look at it this way, you got Aquaman, WW, Flash, and GLs. Over 50% of the DC guys can lift over 100 tons, fly past orbital velocity, and other amazing abilities. Most of the mutants possess only one power (e.g., cyclops and nightcrawler). THey just dont fit in.. Try putting them up against Doomsday, Darkseid, Spectre, Superman, and Captain Atom. There would be few that would blend in sorta
Guys that might stand a chance:
Phoenix
Magneto
Xavier
Apocalypse
Namor
Colossus
Cable
Nate Grey
he's not asking how they compare to the Justice League.... seems more like he wants to know how society as a whole would feel about mutants... in which case this is in the wrong forum
I see most of them combining with a group such as Teen Titans because generally speaking, the regular folk of DCU seem to be more accepting of metahumans.