a) It is early days, so don't get too disappointed just yet.
b) Attack! Attack Attack! In my recent undergrad degree I had reached the point you had (albeit a few more weeks in), and just decided to snarl and critique as and when neccessary. It was my degree, I paid a lot to do it, it meant a great deal to me, so what if the others couldn't keep up, or worked on such a basic level of understanding that it was laughable they were there in the first place? That's their damn problem. I found that the lecturers went with it - they were bored and wanted to be challenged. Sometimes, yeah, it lead to me having a discussion with the lecturer while the others sat there slack-jawed for 2 hours, but if they weren't going to make the effort, read the books and present an argument, they shouldn't be there.
You're not wasting your time, you're having your time wasted. It's well within your power to reverse this state of affairs. After all, you're not there to make friends, are you? And anyway, my approach didn't appear to make me unpopular per se, it just added a different dynamic to the group.