My one and only accusation to the musical notation is that sometimes some information is hidden (like swing, slide, accents) in the music genre or context, and

My one and only accusation to the musical notation is that sometimes some information is hidden (like swing, slide, accents) in the music genre or context, and I am unable to play it correctly unless I have heard it before (or at least learned something similar in the context it was created in). But the more pieces I learn to play, the more I will be able to play. It's like a language. If you just started, don't complain about the spelling rules or idioms. Just learn them and you will flow. I also tend to help myself by rewriting parts of the music to the computer (musescore), especially in case of some really messed up rhythms, however, if there is contextual information in it, the computer won't help me here.