I believe the difference between games and movies is irrelevant to the religion discussion... rather, certain religions are considered 'acceptable' to Christians, and others are not. Witches & Warlocks, Satanism, Voodoo... no matter the context, some Christians will object to them. But Buddhism, for some reason, does not bother most Christians.
I think it is partly because it is an eastern religion... Buddhism has rarely competed directly with Christianity, though Christianity has tried (and generally failed) to compete via missionaries.
Whether it is the age of Buddhism, the remoteness of it, or the ideology that makes Buddhism less offensive to Christians, I don't know. But I suspect a Buddhist book, game, or movie will receive less criticism or reactionary vitriol than an equivalent book, game, or movie featuring witches and wizards.
Myrddin