In terms of being accessible, on a scale from 1 to 10, where 1 is a great introduction to the setting and 10 is a horrible one, it's about a 1 or 2 if you can pick up on context, and a 4 if you can't.
Alright that sounds great! Most of the time if I don't understand something I tend to either reread the section I don't get or I do some research. That way I don't feel so in the dark.