I would have to go along with that. It depends on the skill level/experience of the user more than anything else as to what the assessment is of a DE is on a scale of mild to wild. That is where the rub is in most reviews.
Bob
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Filobiblic - That's a great way to describe those terms. It also covers some of my concerns about classifying a razor as mild or aggressive.
In my case, when I first started out using DE razors, I found the New Improved Gillette's to be too aggressive. Now I find them to be mild (but still efficient). Experience matters. :)
To go back to the OP's question: Some slants are mild and some are more efficient. The same applies to adjustables (though most of them can span a wide range of the efficiency spectrum).