As a user of it I can say several things:
Pro's
Folders, Organization, Dates, I heard you like Mudkip meme came from it from April Fool's one year when all avatars on the site were force changed ( Also as someone who lived through the mudkip avatar take over, it's sad to see that you cannot find that pixel April Fools avatar art anywhere cause it was hilarious )
Con's
Porn, smut, nudes EVERYWHERE, constant changes to the UI without care or rhyme or reason of why and doesn't listen to feedback from the community ever about anything, forums are a joke, "live chat" is a joke, constant pushes for cash grabs to use features that used to be available for free
Most to all of these cons are why "exodus" happens from time to time, usually when the UI has some overhaul. They flee to tumblr, insta, wherever. And yet, none of these sites hold the same sort of organization as devART does. Even with it's current "black is the new green" BS layout, it still is organized better than any of the attempted replacements that people flee to in the exodus.