Those looking for a series of intricate and challenging boss fights will much prefer Terraria's RPG experience.
The Warden looks to be something better in this regard as a creature that players aren't supposed to be able to kill, but that's just one creature. The Ender Dragon isn't a difficult boss, and The Wither can be a challenge but is easily beaten when prepared for.
In a game with infinite possibilities, Minecraft's lack of menacing challenges for the player to overcome can be rather disappointing for some.
