A lot of people would treat this as a movie that you would be judging like it was mission impossible or anything like that, for high expectations.
I consider this a fan-made movie, and for a fan-made movie, it was pretty damn good! I won't give it a 5 star because I noticed that the CGI for the demons looked EXTREMELY fake/cartoonish at some times and the characters DID do some dumb decisions, but when certain things happened, I felt with the characters! When a certain character died, I teared up a little, because the characters were good, and I liked them!
I also like how they put in some references to a certain American in the movie too, and how I noticed that they made the BFG 9000 to look like the one from Doom 1 or Doom 2! In summary, I loved it, could use a little bit of editing work, but overall, a good movie and I didn't feel like I wasted 1 1/2 hours! 4/5