Pretty good time at the movies. While the "anime girl eyes" ensure you don't forget Alita is a CGI character, apart from that you completely buy her performance as a real live character, except the way ridiculous fight moves which hold true to anime stylings. They damn near sidestepped the uncanny valley.
If you've seen the anime you largely know what to expect and should probably enjoy yourself. If you aren't familiar with the anime, who knows what you'll think.