After finding the set pictures, I believe that while this wave may not have the best of builds, besides The Jungle Tree House and The End Portal, the selection of new mobs is quite exceptional. The Iron Golem has a new head, which could be used for Villagers in future sets, and appears squared, yet posable. I agree that the Cave Spider should have navy blue parts for the legs, instead of the black ones that they have. But, I am quite content with how the Wither Skeletons turned out, being taller than the other minifigures, as well as the Wither, which would seem large enough to be accurately scaled.