the metronome work is always a bit boring, but that's practice for you. just keep in mind that you have to lay a technical foundation before you can really turn it into music. but bach is intense, man. bach is the work of a lifetime. more than any other composer I can think of, there is a vast gap between being able to play the notes, and being able to play the piece well.
I've heard the cello suites played hundreds of times by dozens of bass players, they're required rep for lord knows how many auditions, I've been playing them myself for almost the entire 20 years I've been playing bass, and-- I kid you not-- I am typing these words as I take a break from practicing suite 2. the reason they are so ubiquitous in bass players' rep is, for one thing, how you play them will show every flaw in your technique, and provide a window into your entire approach to the instrument. but it's also because if you've got them nailed they are so beautiful, and so deep. by giving just a little weight to a note here and there, you can bring out whole new melodies that bach hid in those straight 16ths, and by letting the right notes ring a bit, you can outline chords and harmonize like an entire string quartet. two different players, using the exact same music, will play completely different pieces.
but first! you gotta grind it out with that metronome, and metronome bach is incredibly boring. so you really should track down a recording or two for inspiration. doubtless your teacher is an excellent musician, but chances are he can't play as well as yo-yo ma or mstislav rostropovich. I actually keep ma's 1983 double-cd set cued up when I'm practicing for reference!
sorry for the long post!