This movie is suffering from what I'd like to call the Game of Thrones effect; the way the ending defines a person's lasting opinion regardless of what came before. GOT was freakin' amazing, but to many people it is a festering pool of lameness, because the last series (or 2) was written by a spoon.
The Colony is kinda the same. I can honestly say, for the entire first half of the movie I was thinking: this movie doesn't deserve a 5/10. It has a solid post-apocalyptic atmosphere, an interesting somewhat-innovative premise, decent acting, and an intriguing story with good tension building. The CGI was a bit weak in places, but I didn't care because I was adequately immersed. Reading the other reviews, I think most people felt the same. So 50% of this movie is a solid 7/10 ... for real post-apocalyptic fans maybe even an 8/10.
The problem is, after the real enemy is revealed, the tension rapidly drops away and a simple bland survival story begins. There's nothing at all innovative from here on. The action is underwhelming and the enemy is also underwhelming (but they're clearly not zombies as one reviewer thought). Sure, there are multiple holes in terms of realism and believability, but they're the same flaws 100 other higher scoring action movies have made. Also the possibility of the interesting apocalypse-reversal was not explored. Basically, it was just generic not-too-terrible lameness. This part of the movie was a disappointing 5/10.
So yes, as a result of the ending the overall experience is disappointing ... but honestly I think the first half was special enough to justify watching the movie, especially if you're a post-apoc fan. Sit down, forget the IMDB score, pretend it's a hidden gem, and enjoy the first 45 minutes. When you sense it's starting to get lame, which it unfortunately will, crack on with your doom scrolling or whatever you personally do when TV loses your attention.
This might seem like odd advice but IMO, as a post-apoc fan, the beginning has stayed with me somewhat and I feel it'd be a shame to not give it a go.
