Helldivers is a very challenging and addictive Co-Op Shooter.
In Helldivers you play as an elite unit working together to protect the planet Super Earth from invading aliens and enemy races along with liberating their own planets.
The game focuses on completing missions on different planets while fulfilling a set of different random objectives, these objectives range from killing a set number of enemies, to destroying and protecting equipment and even rescuing survivors.

You can play solo or up to 4 players Co-operatively, obviously the more people you have and the more well rounded the team is, the easier the game will be on higher difficulties.
After each successful mission you earn xp which will level your character up so you can unlock more weapons and abilites called Stratagems. Stratagems range from Turrets and Player controlled Mechs, to ammo drops and airstrikes. These Stratagems are integral in completing the harder missions so you need to think about which ones to take with you on each mission and the best times to use them.

The Presentation is well-rounded with both crisp, clean graphics and satisfying weapon sounds and decent voice acting, the music is also catchy.
There are a few issues with the game, for one a lot of lines your fellow helldivers say can get very repetitive, the game also often goes into a event where you can't complete certain missions or boss battles until it's completed.
Overall though Helldivers is a very satisfying top down co-op shooter that requires a lot of teamwork but rewards you with plenty of replay value.