Another great period piece, director Roland Emmerich makes sure to hammer in the historical nature of the movie by aping other films. We know it's historical, because we've seen it before, and before that, and before that. Not only is it historical, but it's timeless, a sign of a truly great historical epic.
Other historical cues include dreadlocks (because braiding is the ultimate symbol of primitiveness), walking from the tundras to jungles to bamboo forests to deserts in a matter of days (because the earth was small and flat back then), and funny accents (because nobody could speak English good).
Furthermore, in order to counter the film's lack of identifiable characters, Emmerich wisely turns to Uwe Boll for advice and turns the film into video games or, more specifically, RPGs for structural elements. In role-playing games, we usually don't have to sympathize with main character, because we are the main character. And only suicidal people don't sympathize with themselves.
Training mission complete, XP gained. LEVEL UP.
BAKU HAS JOINED THE PARTY.
Now entering: CHOCOBO FOREST.
SPECIAL ITEM RECEIVED.
FINAL BOSS AWAITS!
CURSORY AND FORCED LOVE SUBPLOT CAN NOW BE CONSUMMATED.
10,000 B.C.: 3/10