Live action movies can be a hit or miss when they copy from anime or manga. Hollywoodization of any story always goes really bad. Going off script, using multiple directors that never watched a single episode or read a single book, and they always alter Plot line and Character premise. This leaves behind a disaster.
If a Live Action is to be made, the Producer and Director needs to follow the Plot line and Storyline exactly, retelling the story. The fans hate it when they throw in a plot twist that has nothing to do with the story. Characters should not only look correct, but their acting needs to be covincing.
The first movie should be about being stuck and surviving Aincrad, leaving the ending open for a second movie, ALfheim.