It's supposed to be hard so that you can improve yourself. And the series only gets harder.
If you want cheats, walk throughs, and guides to improves, you can always visit a website. I use G4, but you could really go anywhere.
Mortal Kombat: http://www.g4tv.com/games/xbox-360/63918/mortal-kombat/
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Mostly for entertainment.
Video Games usually require a lot of brain power, so they also aid, somewhat, in boosting intelligence.
Video games are also used by government agencies and the modern military to train recruits before training them in the field, as virtual environments are safer.
The simulator training program pilots use to learn to take off, fly and land is also a video game.
Because most people like to be challenged.
if it were easy then what would be the point in playing it.
It would either be because they have never played that game before or they are new to gaming in general. They might lack the hand eye coordination.