If your Marketing program idealizes "Sales Qualified Leads," you're already on the wrong track.
The big clue is: Why does the term even exist?
After all, why would you want to produce anything else???
The Rest of the Story...
The concept of a Sales Qualified Lead grew out of lead scoring systems, which themselves attempted (ineffectively) to separate the good leads from all the junk that Marketing typically produces.
All SQLs did was ask the Salespeople for their opinion, instead of having the Marketing department grade their own work.
But it doesn't change the fact that most Marketing departments produce junk.