A good zombie survival game, focusing on the escape and objective gameplay model. Your at the mercy of your fellow players when it comes to having fun.

Marines vs Aliens, a well balanced asymmetrical first person shooter/biter meets RTS. Having a good team and a good commander is a must.

Did you like DDR? A fan of Roguelikes? If either or both then you'll probably be a fan of NecroDancer. It takes a quick sharp mind and a sense of rhythm

It's fencing with some punches and dive kicks, simple yes, but intense. It's a game of skill, that you can pick up rather quickly.

Zombies in the Source Engine. Solid gameplay, a nice mix of Co-Op and PvP. It has a small list of maps, while they are semi-random, they need more.

[Early Access]: Steady developement, decent sized updates. Strong graphically, fun to build ships and easy to do. Personal favorite for Space Sandbox.

Great resource management game, theming is perfect for those who like the Sci-Fi TV show with a small crew.

As long as they keep to their developement goals, this is the 2010's best Voxel Zombie Survival game IMO. 3D, realistic enough, and it might have cars.

Payday 2 has a great multiplayer experience, starts with the combat focused robberies, and moves to a desire to become a stealth master.