This is a dystopian type movie where body augmentation and wealth allow you to live in the best part of the city high in the sky, while the rest of the poor and desperate fight to get the opportunity to ascend through battle.
The over the top fight scenes look fine but also don't make sense in a physics sense. Alita being fast AND strong makes no sense especially when she is stronger than a giant cybernetic man. The story is kind of pointless, the bounties and the rules behind them are pretty dumb especially when the sentinel type machines can instantly beat any assassin so why even use them. The movie sets up a sequel that will never happen. It's an alright action/sci-fi movie but don't get too invested.