Mercule
Adventurer
I guess I always assumed the 3e dragon sorcerer level was supposed to represent an equivalent awesomeness, but more pure. The flavor of 3e was such that human magic was pretty much debased imitation of draconic power. Dragons "cast" their spells as inherent spell-like abilities. Some may have been intentionally developed, others were just an inherent, "duh"-level understanding of how the multiverse worked. Either way, the dragon could manipulate magic in a way that was more incidental and natural than any arch-mage could truly internalize.