Possibly the best way to learn how to write top-notch copy is to learn the wrong way to write it first:
I do complain about that, a lot. But it’s this lack of copywriting as a skill that is leading to the repetition of some God-awful formulaic lines being used over and over again. Some take on slightly different forms, a quick switch of tense, a word extended here or there, but the premise is the same. And if you find yourself looking down at your sketch pad (if you even use one… most of you are chained to a Mac) and see one of these staring back at you on more than one occasion, it may be time to pull the plug.