I went in expecting pure schlock, but what I got instead was a solid little movie. Compared to most blockbusters, this film is simple and streamlined. It doesn't have a million different, half-baked sub-plots clogging the script. The focus is on our characters and their mission.
Those characters, while a bit stereotypical, are well developed and have complete arcs. They play off each other well, and bring a lot to the film, despite the fact they are lesser-known actors. It's refreshing to watch a blockbuster that doesn't forget the fundamentals of character.
Speaking of movie fundamentals; this story really gets set up and pays off. Very rarely are you teased with something that doesn't pay off in a satisfactory way. True, Overlord doesn't go full, insane, COD Nazi zombies, but it does exactly what this story called for.
To summarize, this is a fun action film that's pretty solid. Kind of reminds me of the good 'ole 90s sci-fi/action flicks. Grab some beer and enjoy. This one's a Good!