That's a little harsh...
They are not garbage, really. For mass produced stock coils they are actually quite good. Yes, they probably could be better, QC could be better, but many vapers use them daily without major issues. And Kanger is constantly trying to improve them; Aerotanks now come with airflow control bases, which also work with ProTanks, both eGo and 510 threaded. My Emow tank is really very good as is and I use it all the time. In addition, Kanger coil heads can be easily cleaned and dry burned. They can be rewicked with cotton or rayon and, of course, they can be rebuilt (just ask Mac), which greatly improves their performance.
Don't forget that there are many vapers out there, in the real world, who don't want to, have no time to, or are not able, for whatever reason--poor eyesight, poor motor skills, whatever--to deal with RBAs. They just want to quit smoking and they need a plug n play device. For them, Kanger clearomizers are a very good option indeed. And since this is a new members forum, I don't want anyone trying to make a transition to vaping get the wrong idea that they can't succeed unless they have at least a working knowledge of the Ohm's Law and Li-Ion batteries; and own a 100 watt mod, a complicated and expensive RBA (preferably imported from Germany), several spools of kanthal wire, a box of Japanese organic cotton and/or rayon, a torch, a multimeter, a strong magnifying glass, a good source of light, a lathe, and a well equipped toolbox containing various wire cutters, dremels, nose tip pliers, nut wings, a set of mini screwdrivers and machine screws (several sizes), and a pin vise (or a coil winding jig).
Off my soapbox now.