Okay, maybe that's a bit of an exaggeration. We all use adjectives and adverbs when we write, and it doesn't always mean we're ignorant or lying. And of course all adjectives and adverbs aren't bad. But clear ideas are best expressed primarily through nouns. Usually, when someone (marketing copywriters especially) puts adjectives in front of a noun, they are covering something up. These offenses take several forms.

• Redundancy—adding an adjective that repeats the meaning of the noun. I am provoked mainly by the adjective "smart," as in "smart marketing." Isn't that just marketing? Isn't all (real) marketing already smart? If that's not bad enough, consider the case when you add another common word, "truly," as in "truly smart marketing." Yikes! Now it's not just redundant. It sounds like you're protesting too much. Why draw so much attention?
• Obviousness—adding an adjective that is already implicit. Here, I am thinking about terms like "great offer." Why would you offer me something that's not great?
• False excitement—adding terms that are designed to generate enthusiasm. The most common is "exciting," as in "an exciting offer." I don't need your rah-rah adjectives (or participles, or whatever) to tell me if the offer is exciting or not. I can decide that myself based on the offer.

A great way to test if your adjectives or adverbs are problematic is to substitute their opposite (or at least a contrary) in the expression. If it sounds weird, then your original modifier wasn't adding any information. If it sounds normal, then chances are your original term was helping. An example here is drawn from above: "a bad offer." Who would offer something bad?  So, that means that "great" is useless. But, if you say "a limited-time offer," then the opposite would be "a non-time-limited offer." There are such kinds of offers, too, and knowing the difference is important. So, "limited-time" is acceptable. It's actually clarifying what kind of offer you have. The point of all this is to help you streamline and simplify your copy. Simple concepts and expressions are more powerful and get more results.