Fan-service is always a tricky thing to get right, both in movies and in video games. When working with material from a big film franchise, there's presumably a temptation to just throw every bit of fan-service at the player, from major character cameos to popular weapons and locations to iconic past lines of dialogue. More often than not, a subtler approach tends to be for the best, though Avatar: Frontiers of Pandora might be an exception to that rule.