Not a new stage at all to the series, it is okay in my opinion. Battlefield also isn’t based on another game, just a plain stage that is simple in design.
It’s also very small and nothing really happens there. More technical fighters like Lucina, Cloud, and Marth do well here. The more flashy characters don’t do too well here.
As there is very little room to breath or hide. Don’t think you can attack at long range here and expect to win.
While technically a different stage, there is a Big Battlefield variant of the stage. It is what it is. Nothing fancy or exciting, but a good stage.