If you just started e-smoking, then that is probably not what happened. From what I understand, the cleaning process takes place after about 1500 puffs.. and you should be nowhere near that number yet. Basically what the cleaning process does, is heat the atomizer for a small period of time, so that all of the residue burns off of it. Where that seems like a good idea in theory, it also makes it taste horrible.
If by some factory fluke that is what happened, then you can run your atomizer under hot water (let the water run through it) for a couple minutes, and then set it aside to dry thoroughly. Once you are sure it is dry, you can "prime" the atomizer by dripping ~3 drops of juice into it, and then insert your cartridges as normal. That should take care of the taste. If you don't have any e-liquid to drip, I would insert a fresh cartridge and let it sit for a minute to let the juice sink down into the atomizer a bit.
There is also the possibility that you just aren't used to the taste of the PG juices yet.. Like stated earlier, your taste buds are damaged from the traditional smoke and will take a little while to heal. Once that happens, you will begin to really taste the flavors.