It is essentially Gorn, which TV Tropes defines as being "Porn with Gore". Although the manga has a rather interesting storyline going on, the anime's main plot is not very complex: you are - more or less - confronted with people dying very explicitly on-screen. The violence is very gratuitous with pretty much nothing being censored - you can expect a lot of dismembered limbs and rain of blood. Nudity and sexual situations are also very explicitly presented.
If you are in the search of something deep and insightful, then this anime might not be what you are looking for. There is some depth, but it is not the series' main driving force.
Nevertheless, if you like gore and are not easily squicked out, then you might just like this.
