Warframe is a free to play sci-fi third-person co-op action shooter. A very cinematic shooter that also has a very original look. The gameplay itself consists of as much gunplay as it does melee, allowing for a great selection of playstyles and maneuvers.
Con Can get repetitive easily
At the very core, Warframe is a game that needs a lot of grinding. You'll always be grinding for new blueprints, relics, materials, credits or just leveling your existing equipment. After a while some of the mission types such as defense (where you fend of waves of enemies), will get really boring. Then it turns out the blueprint or relic is really rare and you'll probably have to repeat that mission about a hundred more times. Coupled with the fact that there's no real progression outside the Mastery Rank, some players may quickly lose interest.