I ended up skipping the next class and going straight to the third in the series, plus we had a change of instructor.  We are playing actual pieces (instead of All for Strings) and the class is more like playing in an orchestra in that the teacher conducts and works on getting a particular sound from each section.  I think I'm still the only one in the class also taking private lessons, though.

Overall, it's more enjoyable than the last class, so I'll likely continue taking them.