First of all, be warned: this thing is gory. There is a lot of blood. Seriously, over the top gore. So have a barf bag ready.
I'm going to try not to give anything major away, but I am going to summarize the stories, so if you want to go in blind, why are you even reading this? Anyway, mild to medium spoilers ahead.
This anthology begins with a wraparound story involving a unit of soldiers in the US answering some kind of call to investigate... something. It's used as a means to segue into the other segments but it's done awkwardly and has nothing to do with the other stories. Just about anyone could have come up with a better idea for a wraparound story.
First segment: An investigative news reporter and her camera guy end up finding people living in the sewer and try to cover it. They become a part of their story. This segment was really bad. And then out of nowhere they nailed it with an great ending! It was hilarious and over the top! I gotta give them credit for that, but it was tough to wade through the whole segment to get to it. I did a lot of fast forwarding.
The second segment takes place in a funeral home and also takes way too long to get going, but again the ending was pretty good, even if it didn't make a whole lot of sense to me. Fun effects at least.
The third segment is basically a mad doctor doing experiments on people turning them into part machine. It's pretty sick. The doctor is Asian (set in Jakarta, apparently) and the segment is subtitled, which might bother some but didn't bother me at all. Easily the best segment and the most disturbing, ending with some surprisingly effective dark humor.
The fourth segment finds us in America with gun-toting religious zealots talking about cleansing the earth. They're somewhere outside of Detroit in the middle of winter and about to target a federal building with an unknown weapon. As the segment goes on, the "weapons" they plan to use make watching these sick idiots kind of hilarious, especially when everything starts falling apart for them. It gets better and better as it goes on.
The end credits name the segments in what I'm pretty sure is not the correct order: Holy Hell, Storm Drain, The Empty Wake, Terror, and The Veggie Masher (which I think is the last scene and not really much of a story). That about sums up the quality of this production.
I love anthology horror movies unless they're really bad. This one is very hit and miss but the 3rd and 4th segments totally make this worth watching for people who can handle the gore. Overall, I gotta give this a solid 7/10 just because of them. Your mileage may vary.