Simple, repetitive, and still a lot of fun
Reputation ranks
Ranks only ever go up; points can drop but your rank stays.
About reputation ranksBattle Towers has such a straightforward concept, and I think that's a huge part of its appeal. A tower, enemies, loot, and a golem waiting to make the top floor much more difficult than the rest.
The towers aren't the prettiest or most complex structures, but they give you an obvious reason to stop exploring and actually fight something. You don't need a quest book or a wiki to understand what you're looking at or what you're supposed to do.
My main criticism would be the repetition. Once you understand the basic tower layout, there isn't a huge amount of variety to the actual experience. The golem and the tower collapsing afterward do help give it a memorable ending, though!
For older adventure and exploration packs, this is still a great addition. Sometimes a simple dungeon with a clear challenge is exactly what Minecraft needs.