Review Detail of _JMR_ in Starting From Sword Art Online

I didn't make it far and you maybe wonder why. Well, mainly because of the grammar, but that's not the only reason. MC seems to be stupid. he has a system and seems to be familiar with it, that means he had it for a while (offscreen), but only after the story begins he's asking important questions like why me ? why am I chosen ?(forgot the other) And beside that you don't get to know what the system does. It could be explained later, but I already lost my interest. The system was mentioned in the first chapter and until now never reappeared. (too lazy to add more)