Naturally I have some idea what makes this film appealing to people still I can't be as forgiving as them. The whole film relies on a concept or premise that has great potential. For me this potential has been wasted.
The whole film lacks an urgency and dread that is essential to make the film work. The monsters in this movie are far from menacing and looked more like villains in a random Scooby Doo episode. Even if some of their actions were brutal it had zero impact on me. The characters we are supposed to be rooting for are made very unlikable and all the time I was asking myself why I should care in the first place. Patrick Stewart as Neo-Nazi could have been real interesting. But his character is nothing more than the big honcho who on occasion says racist things but that is about it. I have seen and experienced far worse so not sure why director Jeremy Saulnier thinks he can impress me with his take on Neo-Nazi's. They were organized and certainly competent as criminals. Still does that make them automatically creepy or scary? Not by a long shot.
If you were planning to watch this because of Anthon Yelchin then I will have to disappoint you because there is nothing special about his acting or role that make it worth your while. In fact I could even go as far to say that this easily is his worst role he has ever played. Not that it was so bad but more that it was lazy and generic.
I truly wished I could recommend this film to you and I did try to get the most out of this. Unfortunately Green Room is not good. Even if you overlook it's many flaws and suspend disbelief it fails to put you on the edge of your seat. There is no redeeming factor or reward for sticking with it. Therefore it's a complete waste of your time.