Easily the best zombie survival game on steam, and probably the most promising alpha I've ever seen. I often watch youtube videos before purchasing a game, and this review has been written with past experience of all the games I've mentioned, with DayZ and H1Z1 being played on friends' accounts. The main reason I recommend this game is because it has some things which are almost unheard of in the zombie survival genre:
1) Zombies. No, not the glitchy, ethereal zombies in DayZ, because Zombies in 7 days obey the laws of physics, and are everywhere, and the regular hordes (completely unheard of in almost every other survival game), as well as variation in zombies keeps combat fresh. We already have vomiting police officer zombies, "feral" zombies that live in caves and take horrendous punishment, undead dogs and mutant hornets. The zombies in 7 days are threats, and, for a long while at least, not a manageable one. By default, they run at night, gaining speed and finesse, turning an already- formidable foe into a nightmare. I won't say much more, but it is called "7 Days to Die" for a reason...
2) It's actually a challenge to survive. This isn't like in H1Z1 where you can live forever off of blueberries until a bear mauls you to death. The scavenging itself is rewarding, but food is low in quantity and far- spread. However, once you survive long enough to have a fortress going, you have time and opportuinty to hunt or farm, where the goals in the game radically shift from getting by on cans to actively improving your wellness, which takes me to the next point:
3) Unique mechanics- Be it the wellness system, weapon quality, the fact that you can get infected and become desperate for a cure, building a base or even simply that zombies run at night, 7 Days has many things that similar games in the genre have merely scraped the surface of, if they've even bothered at all. It's a true game hidden amongst several cash grabs.
4) Singleplayer- This one is probably coming off as a surprise to you right as I read it, but I think it's worth a mention. Singleplayer is a feature that most similar games lack, and that's a really crucial feature for those who want a decent survival game without the constant PvP like in DayZ or H1Z1. It's obviously not initially intended for single player, considering that there's still chat, but it still works, and works wonders.
5) Base building- This isn't like in Unturned or H1Z1 where it is seemingly bolted on as an afterthought. Base building in 7 Days is important (not essential- you can still get by by moving from place to place) for survival in the new world. There are many items easily lootable that serve no practical purpose, but are instead simply decorations to further the impression that base building is a core feature of this game.
6) The devs and community- The Fun Pimps listen to the community, and the community itself is very helpful and supportive. The steep learning curve is quickly offset by the community, who tirelessly answer all questions the noobs may have.
The game itself has regularly been referred to as a mashup of Minecraft and DayZ, but I disagree. From the perspective of a buyer, this may look the case, but it isn't. It's a completely different animal, far greater than the sum of its parts.
Recommended as a 9/10- the learning curve is steep, and there are balance issues, but that's what Alpha was meant to be about. If you're the type of gamer who wants survival, building, a true zombies game or an amalgamation of the three, then this is the game for you, and you won't regret buying it.