I like it. it serves the purpose of being a monument area, and at least I won't get lost in it or will have to run around miles and miles to get from the monument to my local storage. There's nothing wrong with making the players setup a base in a simple environment.
As stated a little bit above, maps do not need gimmicks, and they also don't need one of the following:
- An insane size.
- Block variation.
- Custom mobs.
- Custom loot.
- Insanely big areas.
As long as it is fun to play and well balanced, a map can be good. There's a lot of maps that are just focusing on what's not at the core for making a fun map.