Another reason is that the top game tends to encourage late medieval/Renaissance plate armor, while the bottom seems to encourage various fantasy garbs. To the typical person, someone in full plate armor looks cooler than a historically accurate peasant or a monk, which in turn look less uncool than an elf or a vampire. Even a properly done vampire, dwarf, elf, or wizard looks quite nerdy to the average person. The top image wouldn't be nearly as cool if everyone was garbed as vampiric elven sorcerers instead of 15th century men-at-arms.
Highest worldwide box office grossing movies of all time
#3: The Avengers (comic book movie)
#4: Harry Potter and the Deathly Hallows Part 2 (wizards)
#6: Lord of the Rings: The Return of the King (swords and armor, elves, wizards)
#12: The Dark Knight (comic book movie)
#13: Harry Potter and the Sorcerer's Stone (wizards)
#15: Harry Potter and the Deathly Hallows Part 1 (wizards)
#17: Harry Potter and the Order of the Phoenix (moar wizards)
#18: Harry Potter and the Half-Blood Prince (yet m0ar wizardz)
#19: The Lord of the Rings: The Two Towers (swords and armor, elves, w!z4rd5)
#22: Harry Potter and the Goblet of Fire (I put on my robe and wizard hat)
#23: Spider-Man 3 (comic book movie)
#25: Harry Potter and the Chamber of Secrets (wizzle, yo)
#26: The Lord of the Rings: The Fellowship of the Ring (swords and armor, elves, anyone for wizard staff?)
Can we stop wringing our hands about looking "nerdy" to the "average person," yet?