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.
There is a premium currency used in the game that is rarely given out so users who want to advance quickly or do well in multiplayer will be forced to pay real money in order to upgrade to a competitive level.
Deer Hunter 2014, like many other free to play games is pretty easy. This way casual players will stick around to spend bucks on the artificial roadblocks set in place by the developers as to encourage users to spend their money to continue playing a game with little challenge.