I think I remember the first time I watched the trailer for Overlord I found myself weirdly interested yet worried about how it turn out; since due to heavy rumours this film would tie into Cloverfields universe (after while not much of hatred on my part, thought the film was good, from most audiences and critics) this wouldn't find its footing being its own thing and would stick to a lot of cliches and simple narrative over the top tropes in being a 'Nazi-Zombie' movie. So now after some time, and to my thankful relief it wasn't related at all to Cloverfield and I grew quite excited after learning the writes of The Revenant and Source Code would be helming the script of this film (and holy crap the posters and look of the film looked so freaking cool and creative), I'm a bit weirded out to say that while I did find some decent enjoyment seeing this, I'm also quite honest a bit let down by the odd decisions it chooses to stick with till the end that kind of made it a bit of a mixed experience. However without going too deep with the issues with the film its worth noting that Overlord does have quite a good amount of strengths worth noting such being a very honestly strong opening that does a good job of setting its characters, visuals, and especially tone and almost unintentional tonal misdirection, a pretty solid script that despite some of its simple structure is pretty decently effective and does rely on trying to get you to try and put its characters and tone balanced along with its story (which is so rare to honestly see in a lot of movies these days as far as balance), there's some pretty solid and wonderful acting from everyone involved with such a unknown cast (except Kurt Russell's son who much like in Black Mirror is showing so much promise as an actor and also literal clone of his dad its almost insane,) the films practical effects and especially creature makeup are something to seriously commemorate for as it never distracts the film and keeps a lot of it both entertaining and impressive, and admittedly there are some nice small moments and characters that I can't deny don't give the film some nice appreciation for trying to be its own thing; plus I can appreciate how much the film does balance on not being too over-the-top and super grounded to the horror/war film tones of Alien, The Thing, and Saving Private Ryan but being its own thing to some good success, which is usually hard to pull off.
However what's unfortunate to mention is that there's a lot that holds this film back, maybe more that comes to personal preference, from being something that maybe with possible inevitable sequels that come out of this (cause despite my problems with it i'm so down for trying to maybe expand on some of this if they're willing to) it can be fixed but for now stick to: Ok characters that unfortunately aren't given much of any full investment or interesting dynamics to help add to the films story (despite their great acting and one of the sub-villains being pretty cool), cinematography that maybe just again is personal preference but felt so artificial at times and wished it was given some more grounded/dynamic camerawork to help add to the tone, an unbearable and inappropriately used soundtrack, often contrasting tone, really formulaic editing that I swear to god even reuses the same shot twice when cutting to a characters face which was so bad it was jarring to the core, and honestly having too much of a straightforward story that doesn't add anything to make this feel immersing or almost 'iconic' to stick with and plays it very by the numbers; which would be fine if the characters had more than what they had going for and not a very linear ending.
So overall while I have a lot of conflicting thoughts with how some major elements played into a lot of the execution of the film, Overlord I must say must be commended for trying to stick with such a balanced (least in story and tone) way and especially in such a sea of endless sequels and connections to other IP's that it thankfully became its own thing. Maybe with some better inclusion to some of its characters to the story and perhaps maybe trying to end it on more grounded terms (perhaps maybe with a dark/noble ending) then this would've probably worked for me better; but as it stands its still honestly solid for what it is. Definitely check it out when you can, has its B-movie moments that I think a lot of people will have a good time with.