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Sure Flash and Green Lantern are A-List DC Superheroes? In DC, Green Lantern and The Flash are A-List. But from a comics-wide perspective, neither Flash or Green Lantern are fit to shine Spider-Man's shoes as a brand, leave alone a title.
From a comics perspective, The Flash has had two big periods...once during the '50s under Carmine Infantino, and then under Mark Waid. For GL, it was under (sigh) Geoff Johns. But outside of that, these were never among DC's most prestigious and prominent titles. Green Lantern especially sunk so low in esteem that he wasn't included in the line-up to the Justice League movie...freaking Aquaman was, as well as upjumped Teen Titan Cyborg but not GL.