I might as well write up a short description of Fallen Earth. Bear in mind it might be out of date since I haven't played for a long time, and the game went free to play in the meantime.
It's an open world MMO set in a post apocalyptic setting. Players play the role of clones that can't die but get resurrected in a lab when defeated.
The game features a very large world almost without any fast travel. I think it tries to recreate the Grand Canyon area in the US, I can't comment on how accurate this is done, because I've never been 'over there'. New characters get a free horse, probably to establish the point that you won't get anywhere foot. It is a very rubbish horse though and new players are encouraged to 'craft' one of their own at first opportunity. Later in the game players are able to create better mounts, motorcycles, buggies and even cars.
The game has a heavy focus on scavenging and crafting. Most items in the game can be crafted from bits and pieces found in the world. Crafting takes time to do in a passive way. To make something the player will need to have the materials in the inventory, then add it to a crafting queue and wait for it to finish. Simple recipes will be done in a few seconds, advanced ones may take days to complete. Players will usually add things to the crafting queue to cook while doing other things in the game, or just before logging off. In this way managing time and ressources becomes an important aspect.
Missions (quests) are fairly normal MMO design, but they integrate well into local stories and larger plots. The mission descriptions are quite good.
Combat and mob behaviour is often considered one of the weakest areas of the game. The game has FPS style combat using an aiming reticule. Attacks can be improved by the use of buffs and debuffs activated with keybinds or a quickbar. Mobs tend to suffer from some rubberband behaviour and sometimes have extremely fast respawn timers. I personally think the game has too many skills and abilities for the combat system, but I think that this is something the developers are aware about and try to prune.
The graphics are good looking, but not technically at a high quality. I personally love the style and the feel, but this may be a downside to some. The game is really good at establishing a survival feel. The player won't feel like a hero, more like a hobo trying to make his/her way in a destroyed world.
The community used to be one of the most friendly ones Ive seen in an MMO. This sometimes changes when games go F2P, but hopefully this is still as it used to be.