The animation was pretty standard TV-budget quality, but it still moved nicely and worked well for the show's snappy comedic timing. The fun character designs, cartoony poses/expressions, and color styling helped OK K.O.! look way better than what its TV limitations would otherwise imply. You also can't deny that the action sequences were pretty damn impressive.
Comedy is subjective, so I can respect if you somehow never found the show funny; that's your business. As far as villains go, Boxman, Venomous, and their hench-children were pretty solid villains: they started conflict, were entertaining, and even posed serious threats in "You're in Control" or throughout Season 3. There's a reason why many fans seem to prefer the Boxbots over the Plazoids.
I agree that the moral of "You Get Me" fell flat and that Enid in general got away with being unnecessarily rude or lazy on one too many occasions, but I believe "Special Delivery" directly addressed that. Ian once said something along the lines of Rad and Enid just being shitty teens whom KO looks up to and sees the best in, which encourages them to be better (see: "You Have to Care" or "Radical Rescue"), so any moments where they're goofing off at work or making jabs at each other is just typical teen behavior. It's all in good fun.
It's totally fine if you're not a fan of the show or how it went about things, but you can't just say it was ALL BAD. I'm sure there's a lot of good you could get from it if you judge it for what it did specifically rather than whether or not it fit your idea of what a cartoon "can and can't do."