The ability to accurately describe "it" would sure be helful though. If you just write "lacking that German "IT" flavor and aroma" I'm afraid you'll tune up a lot of brewers. Recognizing IT is only 1/25 of the job. 
This is the closest I can articulate. Sorry, I really wish I could do better. Terms are so subjective. And I do wonder if there's a genetic element to it (after seeing years of threads of folks who know what it means, and folks who don't). I liken it to the ability to smell asparagus in your urine. Some folks can, some can't.
The 5 elements of “it” in German light lagers.
1) Aroma and first impressions
It: Fresh malt and hop aroma – sign of good things to come. Very clean, slightly sweet but refreshing
Not it: No aroma. Metallic, plastic, organic off aroma coming from the glass. Or overwhelming, cloying malt aroma, or strong, pungent hop aroma overwhelming the malt.
2) Getting intimate - First Taste
It: the “it” we refer to – fresh grain, depth of character and bright notes of a fresh field of grain and flowers. Sometimes spicy, particularly with Czech and East German Pilsners. But clean and balanced with the malt. Sometimes a minerally, salty impression from East German examples.
Not it: Dull, single dimension of malt. It’s there, but not light, fresh and rich. Overwhelming hoppiness as either flavor or strong bitterness.
3) Balance of character
It: the overall impression is of balance between malt, bitterness and hop flavor. Often floral, slightly sweet, and grainy. Rich, bright grainy flavor.
Not it: Dull and flat, one dimension maltiness. Like old malt or darker malt that is heavy on the palate. Or muddy, overly complex flavors as from too many malts.
4) Mouthfeel
It: Clean, crisp mouthfeel. Refreshing and you want to take another sip. Clears out quickly.
Not it: Either thick and sweet or dry, puckering and thin.
5) Finish - Ahhhhh
It: briefly lingering malt flavor and aroma. If you lightly exhale your breath and sniff, you get fresh malt graininess, a bit of hop aroma, and depth of aging character, slight lingering note of sulfur.
Not it: Cloying sweetness or astringent dryness, almost bitter. Lingering hop bitterness that hangs in your mouth for a long time. Yeast bite.