Minecraft wiki entry for Snow_golems, associated text: Harder to build; requires more resources
Weak against multiple mobs
Since only one golem is used, once a skeleton takes it down, your trap is useless.
Depending on the design, can be difficult to replace the golem.
Less useful if the player is nearby, as it generally disintegrates the drops and leaves no experience.
Creates a hazard for the player, and friendly mobs such as wolves.