I've finished watching this series now so here are some thoughts. The following will inevitably contain spoilers.
Overall I thought it was excellent and I'm very pleased it's got a second series. But it wasn't without its problems. It managed to be both very slow moving and frenetic. It seemed to jump around an awful lot - between characters, locations and even timelines. One minute we'd be following Capheus in present-day Kenya, then we'd be in a flashback with Will remembering the little girl. I don't know if it's a consequence of having so many main characters, but the whole series almost felt like a single, very drawn-out pilot.
That said, I thought it very well written, acted and shot. It looked beautiful. I loved the diversity. In fact for me that's one of its strongest points.
For me, though, it seems to lack an emotional connection. Both Riley and Nomi were in put in situations where they could have died but I didn't really get any sense of urgency. I had more of an intellectual response, as in 'Hmm, this is interesting. How will they get out of this?'
I'm looking forward to the next series and finding out more about the characters and about the whole Sense8 thing.