Being as objective as possible:
Good: Awesome fights, variety of scenes and types of filming. Really good representación of the "what if" type of anxiety. Really funny scenes that refer other good classic movies like ratatouille.
Bad: full of plot holes. Bad acting and dialogue. Confusing until the 3/4 of the movie. Bad approach to the premise. Special effects out of context.(Headset button sound doesn't make sense). It never explains why the headset works and who was the main character.
The worst movie i have ever watched. It felt like a waste of time.