What are the best FPS games for iPhone 6?

Firefights are best avoided as the shooting mechanics in the game feel awkward on a touch screen and just do not react fast enough for the gameplay.

Deus Ex: The Fall feels pretty close to the real thing.

Deus Ex: The Fall offers a high level of detail in the game. From the highly explorable areas that have many nooks and corners to discover to the level of detail of the objects in the environment.

There is no way to play this game offline, even for single player mode.

Unlike past titles in the series the story in Modern Combat 5: Blackout stays out of the way by keeping the cut-scenes short.

Modern Combat 5: Blackout has squad vs squad online multiplayer matches,

There is no jump button, reload button or and interaction button, keeping the touch controls interface quite simple. Left side of the screen moves, right side looks around and there is a fire button. This makes the controls simple to understand and use.

While the story and game mechanics are serviceable one has to wonder how much better the game could have been if more attention was focused on these areas during development.

Each weapon in game gives a sense of differentiating power. There is a good selection of guns that all have different shooting abilities and power. Each one allows the player to feel as though they are well equipped for the task at hand.