To sort of add to Anoni;
Game developers underestimate just how smart we really are. Nowadays, every game has what I like to call "Game wide tutorial." You could be half way through the game, and still get messages telling you to "Push X to reload" or "Press B to croush" or "Push LT to aim, RT to shoot."
Honestly, there was once a time where games taught you as you played, without spamming you with what to do every few minutes. Or there used to be a time when, if there was tutorial, you would learn all of your skills right in the first level/tutorial, well enough so you'd never need to worry about (Splinter Cell is the best example.)
Nowadays, they probably stray from that, because they want to "wow" you with cool mechanics. But honestly, most of those mechanics are one time use, and then you never see them again. Sure they're cool, but having ot take your time to learn how to use it, while you use it, at a critical part in the game, can be a pain.