There's been a renaissance in well-researched sword-and-sandals stories in recent years, such as the HBO series Rome, and Age of Bronze remains one of the most ambitious, especially in comics. (Movies like Gladiator and Troy take a lot more liberties, unfortunately.)
It's interesting to compare Age of Bronze with Frank Miller's 300. Though both debuted in the late 1990s, and both are masterpieces, the two are very different. Age of Bronze is a synthesis of mythology, while 300 is a very idiosyncratic adaptation of history (albeit heavily mythologized history).
First, Miller wears his politics on his sleeve, treating Thermopylae as the battle that saved a nascent Western Civilization, whereas Shanower seems more interested in recreating an era. Both are reasonably faithful to their historical sources, but Shanower's equal weight given to archaeological evidence sets him apart. The irony is that, on the battles of the Persian wars, there's a lot more archaeological evidence available, which sometimes conflicts with accounts from Herodotus and later writers.
Shanower's work is also, in its scope, storytelling complexity, and even graphic style, a bit reminiscent of a manga like Katsuhiro Otomo's Akira. Still, even if Age of Bronze ends up being as long as Shanower has projected, it will run roughly half the page length of Akira.