Critics may have dismissed these fantasy movies, but they offer more to the genre than the bad reviews might suggest. The fantasy genre has given us some of the best and most iconic movies of all time, from true classics like The Wizard of Oz to massive franchises like The Lord of the Rings trilogy. However, it is also a difficult genre to get right, with the otherworldly elements, the necessity for significant world-building, and heavy effects often leading to disastrous results.